Chapter 2. Atomic structure

Structure of the atom

100

The smallest subatomic particle

Electron

200

What are the relative charge and relative mass of an electron?

-1 and 1/2000

300

Atoms of different elements have different numbers of these.

Protons

400

(True/False) The elements in the Periodic Table are arranged based on the increasing mass numbers.

False

500

Aluminium has an atomic number of 13. How many electrons does aluminium atom have which would be involved in chemical bonding?

3

Isotopes

100

Isotopes of a given element differ in the number of __________.

neutrons

200

The element chosen as the standard for determining the relative atomic mass.

Carbon-12 or C-12

300

Why do isotopes of the same element have the same chemical properties?

Because they have the same number of outer shell electrons.

400

(True/False) Samples of different isotopes of an element have different chemical properties, but they always have the same physical properties.

False

500

Boron has two naturally occurring isotopes: B-10 and B-11.The relative atomic mass of Boron is 10.8.

Which isotope is more abundance?

B-11

Electronic configuration & the Periodic Table

100

The electronic configuration of ₂₀⁴⁰Ca.

2, 8, 8, 2

200

Which of these electronic structures belong to of a noble gas?

X 2, 8, 2

Y 2, 8

Z 2, 8, 8, 1

Y

300

An element has an atomic number of 16. Which group is this element located in?

Group VI

400

An atom of element X contains:
● 5 protons
● 6 neutrons
● 5 electrons.

In which group and period is X located?

Group III, second period

500

Nitrogen forms a nitride ion with the formula N^3–(atomic number of N = 7).
Which particle does not have the same electronic configuration as the nitride ion?

A. Al³⁺ (atomic number of Al = 13)

B. Cl^– (atomic number of Cl = 17) 

C. Na⁺ (atomic number of Na = 11)

B. Cl^–