Question

Q1 If an element has 2=5, find the valency and name of 2M
an element.​

Answer 1

Answer:

Given 2,8,7 in this first shell can have 2 electrons where as second shell can have 8 electrons 2 in s orbital and 6 in p orbital.

Hence remaining 7 must be only in third shell as third shell has capacity of 18 electrons.

Here in valence shell we have 7 electrons in which 2 are in s orbital and 5 are in p orbital in which 1 is unpaired. Hence valency electrons is 7 for atomic number 17 that is chlorine and valency is 1 as it has to get one electron to get octet configuration.

Answer 2

Answer:

(a) Since, it has 6 valence electrons, it belongs to group no. 16.

(b) It has 3 Valence shells, so it belongs to period no 3.

(c) The number of valence electron is 6.

(d) The valency of E is 2 because it requires 2 electrons to achieve its stability .

(e) It is a non-metal.