graduation of element properties (to electronegativity)

...................... is the covalent compound in which the difference in electronegativity between the elements is relatively high

choose all the possible answers:

what of the following molecules are polar compound.

• water H2O

• hydrogen H2

• ammonia NH3

• oxygen O2

choose all the possible answers:

what of the following molecules are pure compounds.

• water H2O

• hydrogen H2

• Hydrochloric acid HCl

• chlorine Cl2

the difference in electronegativity between the elements of water molecule is ..........

• relatively high

• high

• small

................... is the covalent molecule in which the difference in electronegativity between its elements is High.

the measuring unit of atomic radius is .........

by increasing the atomic number in the same group, the atomic size will ..................... .

the element ₁₁Na has atomic size ................. that of the element ₁₂Mg .

• smaller than

• equal to

• larger than

.............. is the ability of the atom in covalent molecule to attracts the electrons of the chemical bond towards itself.