Language of Chemistry

How many electrons are present in a nitride ion?

• 6

• 5

• 8

• 10

What is the formula of the compound formed between calcium and oxygen?

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Which one of the following has 4 electrons in its valence shell?

• C

• S

• P

• F

A molecule of a compound is electrically _____.

• neutral

• positive

• negative

• charged

When an element exists as a molecule, each unit consists of two or more ____________.

• ions

• radicals

• atoms

• elements

How many valence electrons does silicon have?

• 14

• 4

• 2

• 28

The molecular formula for Nitric acid is ____.

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The symbol and valency of ammonium radical is

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Most suitable element and most widely accepted standard unit for the measurement of atomic mass is ___________.

• Oxygen

• Nitrogen

• Carbon

• Hydrogen

Phosphorus is an example of __________.

• monoatomic molecules

• diatomic molecules

• triatomic molecules

• polyatomic molecules