Where is most of the mass of an atom?

In the nucleus
Orbiting the nucleus in the electrons
Atoms have no mass and are neutral
In the plasmids

Ernest Rutherford fired positive particles at a thin gold foil and showed that most of atoms is empty space. Which particles did he fire at the gold foil?

Alpha particles
Beta particles
Neutrons
Gamma rays

Drag and drop to match the atomic model with the scientist who proposed it

Sort elements

JJ. Thomson
Niels Bohr
Ernest Rutherford

Positively charged material with negatively charged electrons throughout
Central nucleus with protons and neutrons, surrounded by electrons at energy levels (shells)
Central nucleus with protons and neutrons, surrounded by electrons

Which of the following describes the Plum Pudding Model of atomic structure?

A mass of positively charged material with negatively charged electrons dotted throughout
A central nucleus containing protons and neutrons, surrounded by electrons at discrete energy levels (shells)
A central nucleus containing protons and neutrons, surrounded by electrons
A cube shaped object made entirely of electrons

[question number = 07.6] Why did Ernest Rutherford’s experiments with gold foil demonstrate that atoms consist of mostly empty space?

Most of the particles passed straight through the foil
Most of the particles were deflected or bounced back
Most of the particles were destroyed when they met protons in the nucleus
Most of the particles turned into protons

In 1897 JJ. Thomson did a series of experiments that led to the discovery of which particles?

Electrons
Protons
Neutrons
Alpha particles

During Ernest Rutherford’s experiments with gold foil, why did some of the particles bounce back?

Alpha particles are positively charged, they were deflected when the met the positively charged nucleus
Alpha particles behave in unpredictable ways and can randomly change direction due to quantum effects
He fired electrons at the gold foil and when they met protons they were reflected back
Neutrons repel each other

What is the approximate radius of a nucleus?

1 x 10⁻¹⁴
1 x 10⁻⁵
1 x 10⁻⁴
1 x 10⁻³

What is the approximate radius of an atom?

1 x 10⁻³
1 x 10⁻¹⁵
1 x 10⁻³
1 x 10⁻¹⁰

Atomic Models Quiz

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