Atoms, Isotopes, Radiation and Radioactive Decay Quiz

Atoms, Isotopes, Radiation and Radioactive Decay Quiz

7th Grade

45 Qs

quiz-placeholder

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Atoms, Isotopes, Radiation and Radioactive Decay Quiz

Atoms, Isotopes, Radiation and Radioactive Decay Quiz

Assessment

Quiz

Science

7th Grade

Hard

Created by

Mr.MD Hasan

Used 1+ times

FREE Resource

45 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the atomic theory proposed by Democritus?
Atoms are indivisible particles.
Atoms are solid spheres.
Atoms contain electrons.
Atoms orbit the nucleus.

Answer explanation

Democritus proposed that everything is made up of tiny indivisible particles called atoms, which cannot be broken down further.

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Who proposed the plum pudding model of the atom?
John Dalton
J.J. Thomson
Ernest Rutherford
Niels Bohr

Answer explanation

J.J. Thomson proposed the plum pudding model, suggesting that atoms are balls of positive charge with electrons embedded in them.

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What experimental evidence led Rutherford to propose the nuclear model of the atom?
Electrons orbiting the nucleus.
Alpha particles passing through gold foil.
Deflection of alpha particles by a gold foil.
Discrete energy levels of electrons.

Answer explanation

Rutherford observed that some alpha particles were deflected to the side or back when fired at a thin sheet of gold, indicating a compact nucleus.

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

How did Niels Bohr resolve the flaw in Rutherford's model?
By proposing the plum pudding model.
By suggesting that electrons are held in shells.
By discovering protons in the nucleus.
By identifying neutrons in the nucleus.

Answer explanation

Niels Bohr suggested that electrons orbit the nucleus in shells, preventing the atom from collapsing.

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Summarize the development of the atomic model from Democritus to Chadwick.
Democritus proposed indivisible atoms; Dalton described solid spheres; Thomson discovered electrons; Rutherford proposed the nucleus; Bohr suggested electron shells; Chadwick found neutrons.
Democritus proposed indivisible atoms; Thomson described solid spheres; Rutherford discovered electrons; Dalton proposed the nucleus; Bohr suggested electron shells; Chadwick found neutrons.
Dalton proposed indivisible atoms; Democritus described solid spheres; Thomson discovered electrons; Rutherford proposed the nucleus; Bohr suggested electron shells; Chadwick found neutrons.
Democritus proposed indivisible atoms; Dalton described solid spheres; Thomson proposed the nucleus; Rutherford discovered electrons; Bohr suggested electron shells; Chadwick found neutrons.

Answer explanation

The correct sequence of developments in the atomic model includes Democritus's indivisible atoms, Dalton's solid spheres, Thomson's discovery of electrons, Rutherford's nucleus, Bohr's electron shells, and Chadwick's neutrons.

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What particles are found in the nucleus of an atom?
Protons and electrons.
Neutrons and electrons.
Protons and neutrons.
Electrons only.

Answer explanation

The nucleus of an atom contains protons and neutrons.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What information is found at the bottom left of an element's box in the periodic table?
Mass number.
Atomic number.
Elemental symbol.
Number of neutrons.

Answer explanation

The atomic number, which indicates the number of protons in an atom of that element, is found at the bottom left of the element's box in the periodic table.

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