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

• bromine

• aluminum

• graphite

• mercury

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

• oxygen (₈O)

• nitrogen (₇N)

• chlorine (₁₇Cl)

• aluminium (₁₃AI)

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

• metals

• nonmetals.

• noble gases

• no correct answer

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

• a negative ion

• a positive ion.

• a neutral atom

• no correct answer

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

• 92

• 118

• 119

• 117

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

• single covalent

• double covalent

• triple covalent

• ionic

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

• hydrogen

• chlorine

• oxygen

• nitrogen

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

• two metallic

• two nonmetallic

• metallic and nonmetallic

• metallic and noble

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

• monovalent

• divalent

• trivalent

• tetravalent

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

• Hydroxide 

• Sulphate

• Ammonium

• Phosphate