High school chemistry characteristic elements, high school chemistry which elements are the focus

1) The most intense non-metallic element that reacts with water is f

2) the most intense metallic element that reacts with water is CS;

3) The highest elemental hardness is diamond;

4) The colored gas element at room temperature is Cl2;

5) The non-metallic element that is liquid at room temperature is BR

6) The elements with the smallest (largest) atomic radius are; h、cs；

7) the most stable element of the gaseous hydride formed is f;

8) The algebraic sum of positive and negative valency is zero, and the element with the highest hydrogen content in gaseous hydride is c;

9) The most acidic hydrate corresponding to the most ** oxide is HCO4;

10) The largest variety of compounds formed is c;

11) Graphite has the highest melting point among the elemental elements;

12) Only the negative price and no positive price is o f;

13) The lightest metal is Li;

14) The lightest gas is H2;

15) The element in the nucleus of one of the isotopes that has only protons and no neutrons is H;

16) The most amphoteric element of oxide and its hydrate is AL;

17) The aqueous solution of gaseous hydride with the most content in the air is the basic element N;

18) The most abundant element in the earth's crust, the element of hydride in which it is usually liquid is O;

19) The most abundant metallic element in the earth's crust is O;

20) the most reactive non-metallic element, or the most stable element of gaseous hydride, or the element with the weakest reducibility of anions, is f;

21) The short-period element of the gaseous hydride of the element and the hydrate corresponding to its most ** oxide is n;

22) The most reactive metallic element in nature is AL, and the most reactive metallic element in the periodic table is FR.

23) The most reactive non-metallic element in the periodic table is f.

e that?! The most abundant element in the human body: oxygen The earth's crust contains the most abundant element: oxygen.

The most abundant element in the air: nitrogen.

Can you be specific? Main family elements.

Metallic elements: Iron (Fe), aluminum (Al) in the focus, and then sodium (Na), potassium (Ka), magnesium (mg), calcium (Ca), manganese (Mn).

Non-metallic elements: oxygen (O), hydrogen (H), carbon (C), sulfur (S), nitrogen (N), and most importantly halogens i.e. fluorine (F), chlorine (Cl), bromine (Br), iodine (I).

It seems that these are basically these, and you need to know the others, especially those with typical chemical reaction phenomena, I hope it will help you.

Alkali metals, alkaline earth metals, aluminum, chromium, manganese, iron, cobalt, nickel, copper, zinc, silver, gold, lead, mercury.

Halogens, non-metallic elements in short cycles.

h Hydrogen helium.

Lithium. Beberlium.

b boron. c carbon.

n Nitrogen. o Oxygen.

F fluorine. neon.

Na sodium. mg magnesium.

iiibivbvbvib

viibviii

Ibiib13al aluminum.

Si silicon. P phosphorus. Sulphur.

Cl chlorine. ARK potassium.

CA Calcium.

According to the title, if the outermost number of electrons of the y atom is 3 times the number of electrons in the inner shell, then the number of electrons in the inner shell cannot exceed or equal to 3, but can only be 2Then the number of electrons in the outer shell is 6, and because these elements are short-period elements, therefore, Y is the No. 8 element oxygen O, then Z is sulfur S, X is nitrogen N, and W is chlorine Cl. Therefore, you can judge the options one by one:

Option A, the hydride of X is ammonia NH3, and the hydride of Y is water H2O, so this sentence is not rigorous and wrong at the same time; Option B, the most ** oxide of W is HCO4, which is very acidic, and the oxidation is also very strong, and the most ** oxide of Z is H2SO4 sulfuric acid, but this sentence is not too rigorous, if it is to be stronger than the acidity, the concentration of the acid must be limited to the same, there is no here, if the concentration is the same, the acidity of perchloric acid (HCO4) is stronger than that of sulfuric acid; Option C, Z is sulfur, Y is oxygen, so option C is wrong, option D, the compound formed by X and Y is nitrogen oxide, there can be many of the following, NO, NO2, N2O3 ......These are gases, and some things are insoluble in water, such as nitric oxide, so option D is also wrong, so this student, you can think about the answer to this question again. I also hope that my answer can help you and be used by you.

The number of outermost electrons of the y atom is 3 times the number of electrons in the inner shell, then y is 'o'. x is "n". z is "s.""。w is "cl".

A: NH4 is not more stable than H2O.

The hydrate corresponding to the most ** oxide of B W is HCO4, which is more acidic than H2SO4.

c Look at the periodic period of the elements.

The compounds formed by D x and Y have NO, NO2, and NO, which are insoluble in water!!

By focusing on the core of "nature" and grasping the inner connection, we can understand matter more comprehensively, deeply and clearly.

To review this part of knowledge, it is best to find out the important representatives and their important knowledge points scattered in each chapter (see below), jump out of the limitations of the chapters, connect their knowledge points as much as possible, and systematize the knowledge (focusing on the implementation of the name, common name, chemical formula, properties and uses of the substance), you can use the list comparison method (such as CO and CO2, H2, CO and CH4), the formula memory method (such as the solubility law of acid-base salts), the classification memory method (the color and state of common substances), Knowledge network diagrams, etc. In addition, it is necessary to pay attention to summarizing and summarizing the laws of chemical reactions of substances, and apply these laws to solve comprehensive problems. This part of the important knowledge is:

1 Proficiency in elemental symbols.

2. Memorize the valency formulas of elements and atomic clusters.

3. Memorize the solubility table of acids, alkalis, and salts.

4. Memorize substances with characteristic colors.

5 Memorize ions that cannot coexist in the same solution.

6 Application of the order of metal activity.

7 The conditions under which the metathesis reaction occurs.

8 Diagram of the Mutual Reaction Relationship of Element, Oxide, Acid, Alkali and Salt (Six-Circle Diagram) 9 Continuous Reaction Relationship.

1) CA Series:

CA (OH)2 CACO3 CAO2)C Series:

C CO2 H2CO3 NA2CO3 CO23)CU Series:

Cu cuo CuCl2 Cu(OH)2 CuSO4 Cu4)FE Series:

Exam level requirements and exam content.

1 Initial knowledge.

air and water pollution and prevention;

Introduction to fire extinguishers;

physical properties of water;

physical properties of iron;

properties of concentrated sulfuric acid;

methanol, acetic acid, coal and oil, energy;

pig iron and steel; Nitric acid.

2 What you know.

the composition of air and the physical properties and composition of water;

physical properties and uses of O2 and CO2;

O2 industrial manufacturing method;

c. Chemical properties of CO;

uses of lime and limestone;

methane, the nature and use of alcohol;

the general properties of acids and bases;

the nature and use of common salts;

Characteristics and types of chemical fertilizers.

3 Acquired knowledge.

chemical properties of O2, H2, CO2;

Laboratory preparation method of O2 and CO2;

chemical properties of iron;

physical and chemical properties of two acids and two bases;

solubility of common salts;

The interrelationship between elemental, oxide, acid, alkali, and salt.

4.Common and easily confused true/false questions.

1.The larger the atomic radius of an alkali metal element, the higher the melting point, single.

The main group elements are specially prepared for h alkali metals, main 1 and main 2 c o n cl p s iron, aluminum, copper f

Hydrogen, lithium, sodium, potassium, rubidium, cesium, francium - please Li Na join the private interview.

Beryllium, magnesium, calcium, strontium, barium, radium - comparable to Gates was thundered.

Boron, aluminum, gallium, indium, thallium - touching the girl to marry him.

Carbon, silicon, germanium, tin, lead: The returnees migrated westward.

Nitrogen, phosphorus, arsenic, antimony, bismuth - eggs close to the body.

Oxysulfur, selenium, tellurium, polonium - cattle breeding.

Chlorochlorobromo-iodine astatine - father and daughter embroider a little love.

Helium, neon, argon, krypton, xenon, radon - harm to the first move.

1) The most intense non-metallic element that reacts with water is f

2) the most intense metallic element that reacts with water is CS;

3) The hardness of the single tung trace is diamond.

4) The colored gas element at room temperature is Cl2;

5) The non-metallic element that is liquid at room temperature is BR

6) The element with the most nucleus (large) atomic radius is; h、cs；

7) the most stable element of the gaseous hydride formed is f;

8) The algebraic sum of positive and negative valency is zero, and the element with the highest hydrogen content in gaseous hydride is c;

9) The most ** oxide corresponds to the hydrate, and the most acidic is HCO410), and the most diverse compound formed is C

11) Graphite has the highest melting point among the elemental elements;

12) Only the negative price and no positive price is O

f13) The lightest metal is li

14) The lightest gas is:

h2；15) The element with only protons and no neutrons in the nucleus of one of the isotopes is H16) The element with the most ** oxide and its hydrate is amphoteric is Al17) The element with the most content in the air, the aqueous solution of gaseous hydride is the basic element N18) The element with the most content in the earth's crust, the element with hydride in the usually liquid state is O;

19) The most abundant metallic element in the earth's crust is O;

20) the most reactive non-metallic element, or the most stable element of gaseous hydride, or the element with the weakest reducibility of anions, is f;

21) The short-period element of the gaseous hydride of the element and the hydrate corresponding to its most ** oxide is n;

22) The most reactive metallic element in nature is AL, and the most reactive metallic element in the periodic table is FR.

23) The most reactive non-metallic element in the periodic table is f.