STRUCTURE OF ATOMS CLASS 11

Q.1-Which one will have the highest 2^nd ionisation energy?

• (a) 1s² 2s² 2p⁶ 3s¹

• (b) 1s² 2s² 2p⁴

• (c) 1s² 2s² 2p⁶

• (d) 1s² 2s² 2p⁶ 3s²

Q.3-In the modern periodic table, the number of period of the element is the same as

• (a) atomic number

• (b) principal quantum number

• (c) azimuthal quantum number

• (d) atomic mass

Q.6-The number of orbitals in the fourth energy level is

• 32

• 4

• 16

• 9

Q.7-For principal quantum number n = 4, the total number of orbitals having l = 3 is

• (a)3

• (b)5

• (c)7

• (d)9

Q.8-Uncertainty in position of a particle of 25 g in space is 10–5m. Hence, uncertainty in velocity (ms–1) is (Plancks constant h = 6.6 x 10–34 Js)

• 5.0 × 10^–24

• 0.5 × 10^–34

• 2.1 × 10^–34

• 2.1 × 10^–28

Q.9-An element has 2 electrons in K shell, 8 electrons in L shell, 13 electrons in M shell and one electron in N shell. The element is

• Cu

• Fe

• Cr

• Ti

Q.12-14 elements after actinium is called

• a. Lanthanides

• b. Actinides

• c. d-block elements

• d. P- block elements

Q.13- Electronic configuration of Al⁺³ is

• a. 2,8,3

• b. 2,8,8

• c. 2,8

• d. 2,8,8,3

Q.14- Which is not true about the noble gases?

• a. They are non metallic in nature

• b. They exist in atomic form

• c. All are radioactive in nature

• d. Xenon is the most reactive among these

Q.15-Identify the wrong sequence of the elements in a group

• a. Ca, Br, Ba

• b. Cu, Au, Ag

• c. N,P, As

• d. Cl, Br, I