The electron configuration of element X is: 1s²2s²2p⁴

What is the formula of a compound formed when lithium reacts with element X?

Which of the

statement(s) below is/are true?

1) The

relative charge of an electron is 1-

2) The

relative mass of an electron is 1/200

3) Electrons

are found in the nucleus of an atom

The electron configuration of element X is: 1s²2s²2p⁶3s²3p⁴

What is the formula of a compound formed when potassium reacts with element X?

For every individual atom which of the following statements is always true

The electron configuration of element X is: 1s²2s²2p⁶3s²3p⁵

What is the formula of a compound formed when magnesium reacts with element X?

Which

statement best explains the meaning of the term ‘

Which of the

statement(s) below is/are true?

1) An ²⁷Al³⁺

ion contains 14 neutrons and 10 electrons

2) An ¹⁶O^2-

ion contains 8 neutrons and 6 electrons

3) A ¹⁴N^3-

ion contains 7 neutrons and 7 electrons