Write the chemical symbol and name of element 1 and 20

In the periodic table, the names of elements 1 and 20 are hydrogen, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminum, silicon, phosphorus, sulfur, chlorine, argon, potassium, calcium, and their element symbols are h, he, li, be, b, c, n, o, f, ne, na, mg, al, si, p, s, cl, ar, k, ca

Therefore, the answer is: H hydrogen, HE helium, Li lithium, BE beryllium, B boron, C carbon, N nitrogen, O oxygen, F fluorine, Ne neon, Na sodium, MG magnesium, Al aluminum, Si silicon, P phosphorus, S sulfur, Cl chlorine, AR argon, K potassium, Ca calcium

1 h relative atomic mass of hydrogen).

2 he helium.

3 li lithium.

4 be beryllium.

5 b Boron.

6 c carbon.

7 n nitrogen.

8 o Oxygen 4 (3).

9 F fluorine.

10 ne neon.

11 na sodium.

12 mg magnesium.

13 al Aluminum.

14 si silicon.

15p phosphorus.

16 s sulfur.

17 cl chlorine.

18 ar argon.

19 k potassium.

20 ca calcium.

21 sc sc.

22 ti titanium.

23 V vanadium.

24 cr Cr.

25 mn manganese.

26 Fe iron.

27 cobalt.

28 ni nickel.

29 cu copper.

30 zn zinc.

31 ga gallium.

32 ge germanium.

33 as arsenic.

34 se selenium.

35 br bromine.

beforeElement 20The names and symbols are: Hydrogen H, Helium He, Lithium Li, Beryllium BE, Boron B, Carbon C, Nitrogen N, Oxygen O, Fluorine F, Neon Ne, Sodium Na, Magnesium Mg, Aluminum Al, Silicon Si, Phosphorus P, Sulfur S, Chlorine Cl, Argon Argon, Potassium K, Calcium Ca.

The usual elemental form of hydrogen is hydrogen, which is colorless, tasteless, and odorless, and is a highly flammable gas composed of diatomic molecules, and hydrogen is the lightest gas. Hydrogen is used in medicine to ** diseases.

Hydrogen content distribution.

Only extremely rare free state hydrogen exists on Earth and in the Earth's atmosphere. In the earth's crust, hydrogen is only 1% of the total mass masking age if measured by mass, while it is calculated by atomic percentage.

calculation, accounting for 17%. Hydrogen is widely distributed in the self-travel boundary, and water is the "storehouse" of hydrogen - the mass fraction of hydrogen in water.

11%; Approximately hydrogen in the soil; Oil, natural gas, animals and plants also contain hydrogen.

In the air, hydrogen is not much, about five millionths of the total volume. In the entire universe, hydrogen is the most abundant element in terms of atomic percentage. According to research, in the atmosphere of the Sun, calculated by the percentage of atoms, hydrogen accounts for. In cosmic space, hydrogen atoms.

is about 100 times greater than the sum of all other elemental atoms.

1. Element symbols and names of elements 1-20.

Elements 1-10: H hydrogen, HE helium, LI lithium, BE beryllium, B boron, C carbon, N nitrogen, O oxygen, F fluorine, Nene.

Elements 11-20: Na sodium, mg magnesium, Al aluminum, Si silicon, P phosphorus, S sulfur, Cl chlorine, Ar argon, K potassium, Ca calcium.

2. Schematic diagram of the atomic structure of elements 1-20.

1. The names and symbols of chemical elements from 1 to 20.

1. Hydrogen (H) 2, Helium (He) 3, Lithium (Li) 4, Beryllium (BE) 5, Boron (B) 6, Carbon (C) 7, Nitrogen (N) 8, Oxygen (O) 9, Fluorine (F) 10, Neon (Ne) 11, Sodium (Na) 12, Magnesium (Mg) 13, Aluminum (Al) 14, Silicon (Si) 15, Phosphorus (P) 16, Sulfur (S) 17, Chlorine (Cl) 18, Argon (Ar) 19, Potassium (K) 20, Calcium (Ca).

Second, the chemical formula of the substance should be written correctly

Be proficient in memorizing elemental symbols;

When writing the chemical formula of a compound, it is necessary to memorize the valency of common elements and atomic clusters.

The chemical formula of the written compound should conform to the principle of the algebraic sum of the positive and negative valencies of each element as zero;

master the general method of writing chemical formulas;

3. Valency of common elements and atomic clusters:

Monovalent hydrogen (H), chloride (Cl), potassium (K), sodium (Na), silver (Ag);

bivalent calcium (Ca), magnesium (mg), barium (Ba) and zinc (Zn);

II, IV, VI, Sulphur (S), II, Tetracarbon (C);

Trialuminum(Al), tetrasilicon(Si), pentanitrogen, (N), phosphorus (P);

Iron (Fe) has.

Second, the third should be distinguished;

Don't forget that the elements are zero;

minus nitric acid (NO3-) hydroxide (OH-) root;

minus disulfuric acid (SO42-) carbonated (CO32-) root;

Minus three remember the phosphate group (PO43-).

The positive monovalent is ammonium (NH4+).

The symbols for the chemical elements from one to twenty are as follows:

1-5: H hydrogen, HE helium, LI lithium, BE beryllium, B boron.

6-10: C carbon, N nitrogen, O oxygen, F fluorine, ne neon.

11-15: Na sodium, mg magnesium, Al aluminum, Si silicon, P phosphorus.

16-20: S sulfur, Cl chlorine, Ar argon, K potassium, Ca calcium.

The position of an element in the periodic table not only reflects the atomic structure of the element, but also shows the law of gradual change in the properties of the elements and the internal connections between the elements. It constitutes a complete system and is known as one of the important milestones in the development of chemistry.

In the same period, from left to right, the number of electrons outside the nucleus of the element is the same, the number of electrons in the outermost shell increases sequentially, and the atomic radius decreases (except for group zero elements). The ability to lose electrons is gradually weakened, the ability to gain electrons is gradually increased, the metallicity is gradually weakened, and the non-metallic ability is gradually enhanced.

The highest positive oxidation number of an element increases from left to right (except for those without positive valence), and the lowest negative oxidation number increases from left to right (except for the first period, except for the O and F elements in the second period).

Elemental valence.

1) Except for the first period, from left to right in the same period, the highest positive valence of elements in the second period increases from alkali metal +1 to nitrogen +5 (no positive valence for fluorine and no maximum positive valence for oxygen), the highest positive valence of other periodic elements increases from alkali metal +1 to +7, and the negative valence of non-metallic elements increases from carbon group -4 to -1.

2) The highest positive and lowest negative values of elements in the same main family are the same. (except for a, a, 0 families).

The melting point of an element.

1) With the increase of atomic number of elements in the same period, the melting point of the elemental element increases, and the melting point of the non-metallic element decreases. (The melting point of the subgroup reaches the highest in the VIB group and decreases sequentially).

2) From top to bottom, the melting point of the elemental metal composed of the elements decreases, and the melting point of the non-metallic elemental increases. (Parafamily irregular).

The metallicity of the elements.

1) Elements in the same period decrease in metallicity from left to right and increase in non-metallicity;

2) The metallicity of elements in the same main group increases from top to bottom, and the non-metallicity decreases.

Elements 1 to 20 are as follows:

H hydrogen, HE helium, Li lithium, BE beryllium, B boron, C carbon, N nitrogen, O oxygen, F fluorine, ne neon, Na sodium, MG magnesium, Al aluminum, Si silicon, P phosphorus, S sulfur, Cl chlorine, AR argon, K potassium, CA calcium.

Symbols for elements are unique symbols used to mark an element, and can also represent an atom of such an element, and most solid elements are also commonly represented by element symbols. Element symbols are usually represented by the first letter (uppercase) of the Latin name of an element, such as carbon-c. If the first letter of several element names is the same, add another letter (must be lowercase) in the element name after the first letter (it must be uppercase) to distinguish it, such as chlorine-cl.

The modern periodic table was created by Dmitry Mendeleev in 1869 to show the periodicity of the properties of the elements known at that time. Since then, with the discovery of new elements and the development of theoretical models, the appearance of the periodic table has changed and expanded. In this way, Mendeleev also filled in the gaps in the periodic table by closing the properties of some elements unknown at the time.

The subsequent discovery of new elements does have similar properties, which confirms the Zen file's **.

By definition, each chemical element has its own unique atomic order, which is equal to the number of protons in its nucleus, while most elements have different numbers of neutrons in each atom, which is called an isotope.

beforeElement 20The name and symbol are:

Hydrogen allows dismantling of H, helium, lithium, beryllium BE, boron B;

Carbon C, Nitrogen N, Oxygen O, Fluorine F, Neon;

Sodium Na, Magnesium Mg, Aluminum Al, Silicon Si, Phosphorus P;

Sulfur S, chlorine Cl, Argon Ar, potassium K, calcium Ca;Frank hands.

Zinc Zn, Iron Fe, Copper Cu, Hg Hg, Silver AG.

Peculiarities of the atomic structure of the elements.

When determining the electron configuration outside the nucleus, in addition to the law of the electron configuration outside the nucleus.

In addition, it is sometimes necessary to grasp the peculiarities of the atomic structure of the first 20 elements: the imperial sedan chair.

1) Neutron-free atoms in the nucleus: 11h; The number of outermost electrons.

Element equal to the number of periods and the ordinal number of the main group in which the element is located: h.

2) An element whose outermost electron count is 2 times the number of secondary outer electrons: c.

3) An element whose outermost electron count is 3 times the number of secondary outer electrons: o.

4) Elements with the same number of electrons in the outermost shell: h, be, al.

5) Elements with 2 times the number of electrons in the subouter shell: Li, Si.

6) The outermost non-metallic elements with electron numbers of are H and HE.

7) Elements whose outermost electron count is half of the total number of electrons in the inner shell: li, p.

Element No. 01: Hydrogen chemical symbol h, pronounced qīng.

No. 02 Yuan Stupid Contain: Helium chemical symbol he, pronounced hài.

Element No. 03: Lithium chemical symbol li, pronounced lǐ.

Element No. 04: Beryllium chemical symbol be, pronounced pí.

Element No. 05: boron chemical symbol b, pronounced péng.

Element No. 06: Carbon Chemical Destruction Symbol c, pronounced tàn.

Element No. 07: Nitrogen chemical symbol n, pronounced dàn.

Element No. 08: Oxygen chemical symbol o, pronounced yǎng.

Element No. 09: Fluorine chemical symbol f, pronounced fú.

Element No. 10.

The neon chemical symbol ne, pronounced nǎi.

Element No. 11: Sodium chemical symbol na, pronounced nà.

Element No. 12: Magnesium chemical symbol mg, pronounced měi.

Element No. 13: Aluminum chemical symbol al, pronounced lǚ.

Element No. 14: Silicon chemical symbol si, pronounced guī.

Element No. 15.

Phosphorus chemical symbol p, pronounced lín.

Element No. 16: sulfur chemical symbol s, pronounced liú.

The first with the 17th element of the afterlaugh.

Chlorine chemical symbol cl, pronounced lǜ.

Element No. 18.

Argon chemical symbol ar, a, pronounced yà.

Element No. 19.

Potassium chemical symbol k, pronounced jiǎ.

Element No. 20.

Calcium chemical symbol ca, pronounced gài.