Practice Test

Question 1

What error did Mimi make?

Revolt · Accepted Answer

C: No change in mass number occurs in beta minus decay.

Question 2

What experimental evidence led to the development of this atomic model from the one before it?

Revolt · Accepted Answer

B: Equations were used to identify regions around the nucleus where electrons would likely be.

Question 3

What best explains how they should complete the table?

Revolt · Accepted Answer

C: with “Inside the nucleus,” because the particle is a neutron

Question 4

What is the atomic number of this atom?

Revolt · Accepted Answer

B: 8

Question 5

What surprising result is explained using this model?

Revolt · Accepted Answer

A: A few positive particles bounced back because they were pushed away from the positive center.

Question 6

Which best describes nuclear fusion?

Revolt · Accepted Answer

C: Nuclei combine to form a heavier nucleus, releasing energy.

Question 7

Who was the first chemist to organize elements by atomic number?

Revolt · Accepted Answer

B: Henry Moseley

Question 8

An atom of the element chromium has an atomic number of 24 and a mass number of 52. How many electrons are in an uncharged atom of chromium?

Revolt · Accepted Answer

B: 24

Question 9

What is an atomic nucleus?

Revolt · Accepted Answer

C: the central part of an atom, composed of protons and neutrons

Question 10

Seven-eighths of a sample of hydrogen-3 will have become a stable isotope after 36 point 9 years. What is the half-life of hydrogen-3?

Revolt · Accepted Answer

B: 12 point 3  years

Practice Test Answers