Question

ABC and be an element with atomic number 19 will most likely combine chemically with element whose atomic number is 17 11 18 and 20

Answer 1

According to the atomic number chart, Potassium (K) is the element that have atomic number 19.

It can combine instantly with Chlorine (Cl) that has atomic number 17, to form the salt of Potassium Chloride (KCl).

But it cannot combine chemically with Sodium (Na) with atomic number 11, Argon (Ar) with atomic number 18 and Calcium (Ca) with atomic number 20.

Answer 2

it combines with 17th element chlorine because generally 1st and 7th group combine