A few concepts about alkali metals, explanation of alkali metalsWhat is the explanation of alkali me

1. An atom with only one electron in the outermost shell must be an alkali metal element.

Wrong. Hydrogen is not an alkali metal.

2. A metal element that can lose an electron +1 valence must be an alkali metal element.

Wrong. 3. The cation of the element atom that loses 1 electron must be an alkali metal element with the atomic structure of a noble gas element.

Right. 4. The metal that can react with water to release hydrogen must be alkali metal.

Wrong, such as alkaline earth metal calcium, can also react with water.

3 is right.

1.Wrong. Hydrogen atoms are not.

2.Wrong. There are many transition elements that have a +1 valence. For example, in addition to the +2 price of copper, there is also a +1 price.

3.Right. Only the first main group elements have the atomic structure of noble gas elements that lose one electron, and hydrogen does not have electrons outside the atom after losing one electron, and does not have the atomic structure of noble gas elements, so only alkali metals meet the conditions for appeal.

4.Wrong. The second main element is also acceptable, but instead of +1 price, it is +2 price.

3 correct. The outermost shell of an atom is also 1 electron;

2.Sub-metallic elements, such as cu, also have +1 valence;

4.The second main group like Ca and Ba can react with water to release H2.

1 False, the outermost shell of the hydrogen atom also has only one electron.

3 False, the same hydrogen atom can also lose an electron +1 valence.

4 False, alkaline earth metals like calcium can also react with water to release hydrogen.

There are only 2 pairs.

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The explanation of alkali metal words is: lithium, sodium, potassium, rubidium, cesium, francium six metal elements are collectively named. Hydroxides, the alkali metals, are the strongest basic compounds.

The explanation of alkali metal words is: lithium, sodium, potassium, rubidium, cesium, francium six metal elements are collectively named. Hydroxides, the alkali metals, are the strongest basic compounds.

The part of speech is: noun. The structure is:

Alkali (left and right structure) Gold (upper and lower structure) genus (semi-enclosed structure). The phonetic pronunciation is: 一 一 Pinyin is:

jiǎn jīn shǔ。

What is the specific explanation of alkali metals, we will introduce it to you through the following aspects:

1. Citations and explanations [click here to view the details of the plan].

Lithium, sodium, potassium, rubidium, cesium, francium six metal elements are collectively referred to. Hydroxides, the alkali metals, are the strongest basic compounds.

2. Chinese dictionary.

Lithium, sodium, potassium, rubidium, cesium, francium and other six elements. It is easy to melt and volatilize, and its melting and boiling points decrease with the increase of atomic weight, and it has extremely strong positivity. Its hydroxide is the most basic and increases with atomic weight.

3. Network Explanation.

Alkali metal alkali metals refer to the six metal elements in group A except hydrogen (H) in the periodic table, namely lithium (Li), sodium (Na), potassium (K), rubidium (RB), cesium (CS), francium (FR). According to IUPAC, alkali metals belong to group A elements in the periodic table. Alkali metals all have one outermost electron belonging to the s orbital, so this group belongs to the s region of the periodic table.

The chemical properties of alkali metals show very clear homologous behavior and are the best example of periodicity of the elements. Although hydrogen (H) belongs to group A, it appears chemically very different from alkali metals, so it is not considered an alkali metal.

Idioms about alkali metals.

It belongs to the wall, has ears, and it is more than things, and it is generous, and it is purely **.

Words about alkali metals.

It is not good, a family is purely **, Long Xingyun is a look, not a crown, a cover, a family, a rice, I am a human ear, a wall, an ear, a wall, an ear.

Sentence formation on alkali metals.

1. In other words, the entire spectrum of energy levels is just like an upside-down spectrum of alkali metals.

2. Abstract: In the analysis of rock pyrolysis, when the content of alkali metal and alkaline earth metal ions in rock samples is high, the influence of ionization interference often occurs.

3. In this paper, a laser-decelerated alkali metal atomic beam frequency standard is proposed.

4. The test proves that the combination of alkali metal carbonate, alkali metal hydroxide and sodium carbonate and ferric tetroxide all show similar catalytic activity.

5. The valence atom of the alkali metal atom has two states of energy.

Chemical properties of alkali metals:

1. It is a silvery-white metal, with low density, low melting point and boiling point, and high reactivity under standard conditions.

2. They are prone to losing valence electrons to form cations with a single unit of positive charge.

3. They are generally softer in texture and can be cut with a knife to reveal a silvery-white profile; Due to its ability to react with the oxygen in the air, the profile will quickly lose its luster when exposed to air.

4. Due to the chemical properties of alkali metals are very active, they are generally stored in mineral oil or sealed in rare gases to prevent them from reacting with air or water.

5. In nature, alkali metal elements only have a chemical state and cannot exist in a stable elemental form. Alkali metals can react violently with water to form alkaline hydroxides, and their reaction ability and intensity become stronger with the increase of atomic number.

1.Similarities: (1) Silvery-white (cesium slightly golden) (2) Low hardness (3) Small density (4) Low melting point (5) Thermal and electrical conductivity.

2.Law of gradual change: from lithium to cesium.

1) The density is decreasing (but potassium is abnormal).

2) The melting point and boiling point gradually decrease.

Generally speaking, as the atomic number increases, the density of the elemental increases. However, there is an "anomaly" phenomenon from Na to K, according to the density formula = m v, the increase in the relative atomic mass from Na to K plays a smaller role than the increase in atomic volume, so the density of K is smaller than that of sodium.

Golden-yellow metal, soft and light, malleable. Density gram cm3. Melting point, boiling point.

1 kg of high-purity metal cesium valency +1. Ionization energy electron volts. It is the most reactive of alkali metals and reacts violently with oxygen to form a mixture of many oxides (there are at least 7 according to Elemental Chemistry).

In the air, the heat of oxidation is enough for cesium to melt and ignite. Cesium chloride and cesium carbonate are its main compounds.

Some of the physical properties of the two alkali metals & reaction with water.