Practice Assessment 1

1) The electrons present in the outermost shell are called____

• Valency electrons

• Octate electrons

• Valence electrons

• Duplet electrons

2) Imaginary path around the nucleus of an atom in which electrons revolve

• Nucleus

• Orbit

• K-shell

• None of the above

3)The term for the combining capacity of an element is

• Valency

• Atomicity

• Reactivity

• None of the above

4)The shells or orbits are denoted by

• A, B, C, D …

• a, b, c, d,...

• W, X, Y, Z…

• K, L, M, N…

5)The shell, which has two electrons, is

• K shell

• L shell

• M shell

• N shell

6)Maximum number of electrons, the third shell can accommodate is

• 32

• 2

• 8

• 18

7)In general, the n^th shell can accommodate _____ electrons where ‘n’ stands for number of the shell.

• 3n²

• 2n²

• n²

• 2n

8)The electronic configuration of oxygen is

• 2, 7

• 2, 6

• 2, 4, 2

• 4, 4

9)The correct symbol for silver is

• Ag

• S

• Ar

• AI

10)The chemical formula for sodium is

• So

• NA

• Na

• Sd