REVIEW: Chemistry Isotopes Quiz

What is the symbol for a proton?

• p+

• n0

• p-

• e-

Answer explanation

The symbol for a proton is p+ which represents a positively charged particle in an atom.

Who discovered the electron in 1897?

• Aleen Glenn Calugas

• J.J. Thomson

• E. Goldstein

• J. Chadwick

Answer explanation

J.J. Thomson discovered the electron in 1897.

What is the charge of a neutron?

• unknown

• negative

• positive

• no charge

Answer explanation

A neutron has no charge, it is neutral. Therefore, the correct answer is 'no charge'.

What is the mass of an electron?

• 9.1 x 10-31 kg

• 1.67 x 10-27 kg

• 1.36 x 10-27 kg

• 2.0 x 10-30 kg

Answer explanation

The correct mass of an electron is 9.1 x 10-31 kg, which is the first option provided.

What is the basic building block of matter?

• Neutron

• Atom

• Electron

• Proton

Answer explanation

The basic building block of matter is an atom, which is composed of protons, neutrons, and electrons. Atoms combine to form molecules and substances.

What is the atomic number of Carbon?

• 2

• 6

• 4

• 12.01

Answer explanation

The atomic number of Carbon is 6, which corresponds to the number of protons in the nucleus of a Carbon atom.

What is the symbol for Helium?

• X

• He

• A

• Z

Answer explanation

The symbol for Helium is He. In the periodic table, each element is represented by a unique symbol, and for Helium, it is He.

What is the mass number of Helium-4?

• 2

• 3

• 1

• 4

Answer explanation

The mass number of Helium-4 is 4 because it is the sum of protons and neutrons in the nucleus of the Helium-4 isotope.

What is an isotope?

• Atoms with different number of protons

• Atoms with same number of protons but different number of neutrons

• Atoms with different number of electrons

• Atoms with same number of protons and neutrons

Answer explanation

An isotope refers to atoms with the same number of protons but different numbers of neutrons, distinguishing them from each other.

What is the discoverer of the neutron?

• J. Chadwick

• J.J. Thomson

• Aleen Glenn Calugas

• E. Goldstein

Answer explanation

The discoverer of the neutron was J. Chadwick.