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2 years ago

The number main-group elements'valance electrons can be determined by____ on the periodic table

Chemistry

1 answer:

Zanzabum2 years ago

7 0

<h2>Answer:</h2>

Valance electrons can be determined by <u>Group</u> on the periodic table

<h2>Explanation:</h2>

Valence electrons are the electrons present in the outermost shell of an atom. We can determine the total number of valence electrons present in an atom by checking at its Group in which it is placed in the periodic table. For example, atoms in Groups 1 the number of valence electron is one and for group 2 the number of valence electrons is 2.
The groups have number of valance electrons as follow:

Group 1 - 1 valence electron.

Group 2 - 2 valance electrons.

Group 13 - 3 valence electrons.

Group 14 - 4 valance electrons.

Group 15 - 5 valence electrons.

Group 16 - 6 valence electrons.

Group 17 - 7 valence electrons.

Group 18 - 8 valence electrons.

Result: No of valence electron can be determined by the group no. of the element.

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Answer:

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Explanation:

<em>Parts Per Million </em>is defined as the number of parts of a solute per one million parts of a solution.

ppm = (Weight of Solute / Weight of Solution) × 10⁶ ---(1)

Let us suppose that the air (solution) weights 100 grams, then 2.5 % of water vapors will have following mass,

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Mass of Vapors = 2.5 × 100 / 100

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Hence, mass of water vapors is 2.5 g.

Now, putting mass of water vapors and air in eq. 1,

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The number main-group elements'valance electrons can be determined by____ on the periodic table​

The number main-group elements'valance electrons can be determined by____ on the periodic table