Question

An element A with an atomic number 11 and B with atomic number 17 react to form a compound. What is the formula of the compound formed?

Answer 1

Answer on Question #81141 – Chemistry – Organic Chemistry

Task:

An element A with an atomic number 11 and B with atomic number 17 react to form a compound. What is the formula of the compound formed?

Solution:

1) A sodium atom (Na) has atomic number 11.

A has electronic configuration - 2,8,1.

It has 3 shells or orbits so it is placed in period 3

It has 1 electron in its outermost shell so it is placed in group I A

2) A chlorine atom (Cl) has atomic number 17.

B has electronic configuration - 2,8,7.

It has 3 shells or orbits so it is placed in period 3.

It has 7 electrons in the outermost shell it is placed in group VII A

$$Na^{+} + Cl^{-} = NaCl$$ $$NaCl - sodium chloride$$

Taking of electrons bond present between them is ionic bond.

$$\ce{Na* + *Cl* -> Na+ + *Cl* -> NaCl}$$

Answer: sodium chloride will be formed (NaCl).

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