Everyday Science · Atoms, Elements & Compounds · page 30 of 30

Atoms MCQs with Answers

Includes 16 past paper MCQs (marked).

Timed quizzes, instant results, track your progress — free

Atoms MCQs (291–297)

7 MCQs with answers and a short one-liner. Hide answers to test yourself.

Answers and one-liners are hidden. Tap an option to check that question, or show all.

291.
An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of an atom is?
Correct Answer: C. 23
One-liner
The atomic mass (mass number) is the sum of protons and neutrons, so 11 + 12 = 23.
292.
The position of an element in the Periodic Table is determined by its number.
Correct Answer: B. Proton
One-liner
The position of an element in the Periodic Table is determined by its proton number (atomic number).
293.
What are atoms of the same element with the same number of protons but different numbers of neutrons called?
Correct Answer: C. Isotopes
One-liner
Atoms of the same element with the same number of protons but different numbers of neutrons are called Isotopes.
294.
Protons and neutrons are collectively known as _?
Correct Answer: D. Nucleons
One-liner
Protons and neutrons are collectively known as nucleons because they are the particles that reside in the nucleus of an atom.
295.
A Lewis structure is a representation of a molecule that shows the disposition of ?
Correct Answer: D. Valence electrons
One-liner
A Lewis structure shows the arrangement of valence electrons around atoms in a molecule.
296.
What are considered the building blocks of all matter?
Correct Answer: D. Atoms
One-liner
Atoms are considered the building blocks of all matter.
297.
A 4s orbital has _?
Correct Answer: A. Three nodes
One-liner
A 4s orbital has three nodes (one radial node and two angular nodes, or equivalently, n-1 = 3 total nodes).