Page 29 - Chemistry_Form_2

Chemistry
for Secondary Schools

(a) Electronic configuration
(b) Radioactive decay
(c) Atomic mass
(d) Relative atomic mass
FOR ONLINE READING ONLY
4. Most atoms are neutral because they have

(a) nucleus which is only made up of neutrons.
(b) equal numbers of electrons and protons in the shells.
(c) neutrons with zero charge.
(d) the number of electrons which balance out the number of protons in
the atom.
5. Which of these statements is true about isotopes of an element?

(a) Contain the same number of protons, but different number of neutrons.

(b) The number of neutrons is the same, but the number of protons is
different.
(c) Proton and neutron numbers are the same, but those of electrons are
different.
(d) Electrons are added to the nucleus,with the same number of protons.

6. Which sub-atomic particles are equal in number to protons in a neutral
atom?
(a) Electrons
(b) Neutrons

(c) Electrons of its ion
(d) Neutrons of its ion

7. The atomic number for an element T is 9. What is its electronic configuration?
(a) 2: 4: 3 (b) 2: 5: 2

(c) 2: 7 (d) 2: 6: 1
8. In medical diagnosis and treatment, isotopes are used in

(a) detecting malaria parasites by using special scans.

(b) using radioactive tracers for imaging and treating cancer.
(c) treating typhoid infections by using antibiotics.
(d) determining a patient’s age by checking body cells.

22 Student’s Book Form Two

01/08/2025 11:20:52
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 22
CHEMISTRY FORM TWO NEW 2025 DUMMY.indd 22 01/08/2025 11:20:52