Question

Can anyone answer to this question it's urgent

Answer 1

Polyatomic atoms are the group of atoms that have a net charge on them.

Hence ions are charged particles .

Example :

1. Sulphate ion --- SO4⁻²

sulphate ion contains atoms of sulphur and oxygen atoms with a net charge of -2


2. Carbonate Ion -- CO3⁻²

Carbonate ion contains atoms of carbon and Oxygen with a net charge of -2

Answer 2

1, chlorine has 17 electrons

2.k=2 . l= 8. m =1

3.Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves.

4. Chronic diseases generally cannot be prevented by vaccines or cured by medication, nor do they just disappear. ... Cardiovascular disease.

5.. the strength and vitality required for sustained physical or mental activity

6. pteridophytes are called as amphibions of plant kingdom

7.a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.