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All of nonmetals don't conduct electricity, except...........

All of these elements can form negative ions, except.....

The element which has atomic number 12 is considered from ……………………

When an atom of an element loses one electron or more, it changes into …………

The number of known elements up till now is ……………… elements

The bond in a sodium chloride molecule is......... bond

There is a triple covalent bond in ……………………….. molecule

The covalent bond usually arises between....... elements

Element (M) forms a compound M(OH)₃ so, its valency is ………………….

Which of the following is a trivalent atomic group?...