The nitrogen atom has 7 protons and 7 electrons,The nitride ion will have
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In known elements, the maximum number is of
A radioactive substance has a half life of four months, three-fourth of the substance would decay in
Which one of the following is commonly used as an indicator to measure the exact pH?
The isotopes of chlorine with mass number 35 and 37 exist in the ratio of
The movement of water molecules through the plasma membrane is called ______.
Isotopes of an element have ______.
The most abundant of the rare gases i ?
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