Chemistry
When a bond is formed between two atoms, the energy of the system will

Increase
May increase or decrease
Decrease
Remain the same

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Chemistry
Water cycle refers to

Water distribution in relatively dry areas
Constant movement of water from ocean to land and back to ocean once again
An integrated attempt to recycle water in relatively arid regions
Scientific management of water in areas excessively plagued with water-logging

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Chemistry
The mass number of a nucleus is

a fraction
the sum of the number of protons and neutrons present in the nucleus
always less than its atomic number
always more than the atomic weight

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