3. Write chemical formula for the following
(a) nitrogen
(b) aluminium

Nitrogen:N2

Aluminum:Al

Explanation:

Nitrogen:The chemical formula for nitrogen gas is N2. The formula can be represented as N≡N.

Aluminum: Aluminum is a silvery-white metal which is extremely soft by nature. Totally earth's crust contains 8% of Aluminum.

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a.N

b.Al

Explanation:

nitogen is N in upper case and aluminium is Al.always the second letter is lower case

8

explanation:

each principal energy level above the first contains one s orbital and three p orbitals. a set of three p orbitals, called the p sublevel, can hold a maximum of six electrons. therefore, the second level can contain a maximum of eight electrons - that is, two in the s orbital and 6 in the three p orbitals.

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stratosphere, is the answer for (apex)