1.
The relative atomic mass of Na is
2.
The mass of an atom relative to C-12 is
3.
Over 70% of earth's crust is covered with
4.
The list which contains only elements is
5.
The formula mass indicates the simplest ration between
6.
The smallest part of an element that cannot exist as a free state is
7.
A free radical has
8.
Branch of chemistry dealing with the plantation and overcoming greenhouse effect is
9.
1 mole of a substance refers to
10.
The number of protons in the nucleus constitute it's
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