Question

3. Write the correct representation of an element 'X' which contains 15 electrons
and sixteen neutrons.

4. What will be the valency of an atom if it contains 3 protons and 4 neutrons?
28.5​

Answer 1

Answer:

An element with 3 protons would have 3 electrons and it's electronic configuration would be 2, 1. So, by losing the outermost electron it would acquire a stable duplet. Hence, its valency would be +1

Explanation:

Answer 2

Answer:

3. number of electrons in element X = 15 and number of neutrons = 16 Atomic number = number of protons = number of electrons in neutral atom = 15 Mass number = number of protons + number of neutrons = 15+16=31

4. An element with 3 protons would have 3 electrons and it's electronic configuration would be 2, 1. So, by losing the outermost electron it would acquire a stable duplet. Hence, its valency would be +1