The combining capacity of an element is known as its ______________.

Q.

Fill in the blanks:

(a) Matter is neither …………….. nor ……………... in a chemical reaction.

(b) In a compound, the constitute elements are always present in a definite proportion by ……………. .

(c) Two or more elements combine to form ………………… .

(d) The combining capacity of an element is known as its ………………. .

Q. An element A has a valence electronic configuration $3s^{2}3p^5$ and the other element B has a valence electronic configuration $3s^1$. The bond formed between them is:

Q.

An element A has 2 electrons in its fourth shell.State:

(a) its atomic number

(b) its electronic configuration

(c) its valency

(d) position in the periodic table

(e) is it a metal or non-metal

(f) is it an oxidising or reducing agent.

Q.

The electronic configurations of three elements A, B and C are as follows:
$$\begin{array}{cc}A& 2,8,1\\ B& 2,8,7\\ C& 2,4\end{array}$$

(a) Which of these elements is a metal?
(b) which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which tow elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?

Q.

The electronic configuration of an element X is 2,8,6.

i. What is the number of valence electron in an atom of X?

ii. Is it a metal or a non-metal?