What are likely formulas for the following substances?

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What are likely formulas for the following substances?

(a) GeCl?

(b) AlH?

(c) CH?Cl2

(d) SiF?

(e) CH3NH?

Solution

Identify the group of the central element to predict the number of covalent bonds the element can form.

(a) Germanium (Group 4A) has four electrons in its valence shell and forms  four bonds to achieve the noble-gas configuration of neon. A likely formula is GeCl4.

Element     Group     Likely Formula

(b) Al              3A            AlH3
(c) C               4A            CH2Cl2
(d) Si              4A            SiF4
(e) N              5A            CH3NH2

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