Question

1. Elements A,B and C have atomic number 17 , 19 and 10 respectively. a) State which one is : i) a non-metal ii) a metal iii) chemically inert​

Answer 1

Answer:

i) 17 A

ii) 19 B

iii) 10 C

Explanation:

• Metal either 1 2 or 3 in last shell
• Metal either 1 2 or 3 in last shellNon metal either 4 5 6 or 7
• Metal either 1 2 or 3 in last shellNon metal either 4 5 6 or 7inert 8

17 atomic configuration 2+8+7 so the last one is neither one two or three, not 8 so it's neither non metal nor inert

19 electronic configuration 2+8+8+1 it has 1 electron in the last shell so it's metal

10 electronic configuration 2+8 so it's inert as it's stable because it has 8 electrons in it's last shell