Choose the correct answer.

Test Your Concept multiple-choice questions:

1. Tick the correct alternative.

a. Which of the following is the correct number of periods in the modern periodic table?

ii. 7

b. Why do elements in the same group show similar chemical properties?

iii. They have the same number of valence electrons.

c. Which element will have the highest electronegativity in the second period?

iv. Fluorine

d. Which statement best explains why atomic size decreases across a period?

i. Nuclear charge increases while shells remain the same.

e. In which group does sodium belong to in the periodic table?

iii. group 1

f. On which basis, are elements arranged in the modern periodic table?

iii. atomic number

g. Which of the following belong to the same period?
(Looking at the table: A=2 (Helium, Period 1), B=10 (Neon, Period 2), C=5 (Boron, Period 2), D=11 (Sodium, Period 3))

ii. B, C

h. What is the molecular weight of ammonia?
(Nitrogen = 14 amu, Hydrogen = 1 amu × 3 = 3 amu. Total = 17 amu)

i. 17 amu