Five atoms are labelled from A to E. Atoms Mass No. Atomi

1.	Five atoms are labelled from A to E. Atoms Mass No. Atomic No. A 40 20 B 19 9 C 7 3 D 16 8 E 14 7(a) Which one of these atoms:(i) contains 7 protons,(ii) has an electronic configuration 2, 7?(b) Write down the formula of the compound formed between C and D.(c) predict which are: (i) metals, (ii) non-metals?
Answer» (a)(i) E (ii) B (b) C₂D (c) A and C are metals while B, D and E are non -metals.

Five atoms are labelled from A to E. Atoms Mass No. Atomic No. A 40 20 B 19 9 C 7 3 D 16 8 E 14 7(a) Which one of these atoms:(i) contains 7 protons,(ii) has an electronic configuration 2, 7?(b) Write down the formula of the compound formed between C and D.(c) predict which are: (i) metals, (ii) non-metals?

Answer»

(a)(i) E

(ii) B

(b) C₂D