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Q 01 / 25
An atom is electrically neutral because the number of protons equals the number of electrons.
Q 02 / 25
J.J. Thomson discovered the neutron.
Q 03 / 25
The nucleus of an atom contains protons and neutrons.
Q 04 / 25
Electrons are found in the nucleus of an atom.
Q 05 / 25
Rutherford's alpha particle experiment led to the discovery that most of the atom’s space is empty.
Q 06 / 25
Bohr’s atomic model says electrons revolve in fixed energy levels or orbits.
Q 07 / 25
The charge of a proton is equal in magnitude but opposite to the charge of an electron.
Q 08 / 25
Isotopes have the same number of protons but different number of neutrons.
Q 09 / 25
The mass number of an atom is the sum of its protons and electrons.
Q 10 / 25
Only hydrogen atoms have no neutrons.
Q 11 / 25
The value of atomic number (Z) can be same for two different elements.
Q 12 / 25
All canal rays are composed of neutrons.
Q 13 / 25
The electron was discovered by J.J. Thomson using cathode ray experiment.
Q 14 / 25
Electrons are negatively charged particles.
Q 15 / 25
In the modern atomic model, protons and neutrons are confined to the nucleus.
Q 16 / 25
The sum of protons and neutrons is called the atomic number.
Q 17 / 25
Lewis symbols represent atoms using their valence electrons.
Q 18 / 25
Valency refers to the combining capacity of an atom.
Q 19 / 25
Dalton believed atoms are indivisible.
Q 20 / 25
The first atomic model was given by Rutherford.
Q 21 / 25
An element with atomic number 8 has 8 protons and 8 electrons.
Q 22 / 25
The number of neutrons in atom can be found by subtracting atomic number from mass number.
Q 23 / 25
Isobars have the same atomic number but different mass numbers.
Q 24 / 25
Shells in an atom are represented as K, L, M, N.
Q 25 / 25
The central core of an atom is called nucleus.

Frequently Asked Questions

Atoms have a nucleus made of protons and neutrons, with electrons arranged in shells around it.

James Chadwick discovered the neutron in 1932.

Protons, neutrons, and electrons.

The number of protons in the nucleus of an atom.

The sum of protons and neutrons in the atom’s nucleus.

Atoms of the same element with different numbers of neutrons.

Atoms of different elements with the same mass number but different atomic numbers.

The number of electrons an atom can gain, lose, or share to become stable.

Electrons revolve in fixed orbits (shells) around the nucleus without losing energy.

Atomic number is protons; mass number is protons + neutrons.

Electrons fill shells in order, with each shell holding up to \(2n^2\) electrons.

J.J. Thomson.

The gold foil experiment.

Electrons in the outermost shell of an atom.

They have the same number of protons and electrons.
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