Q9. The table gives data about four substances. Which substance could be an ionic compound? Electrical conductivity compound Melting point (°C) in aqueous solution А -73 good B 32 poor с 474 poor D 805 good

D. 805 good

Explanation:

Can't really see the table but ionic compounds have high melting points and are good conductors.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).