How is the number of neutrons in the nucleus of an atom calculated?

Subtract the number of protons from the mass number.

Add the number of electrons and protons together.

Subtract the number of electrons from the number of protons.

Add the mass number to the number of electrons.

The atomic mass of an element is the ____.

weighted average of the masses of the isotopes of the element

total number of subatomic particles in its nucleus

total mass of the isotopes of the element

average of the mass number and the atomic number for the element

Dalton's atomic theory included which idea?

Atoms of the same element are always identical.

All atoms of all elements are the same size.

Atoms of different elements always combine in one-to-one ratios.

Individual atoms can be seen with a microscope.

How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?

50 protons, 50 electrons, 75 neutrons

75 electrons, 50 protons, 50 neutrons

120 neutrons, 50 protons, 75 electrons

70 neutrons, 75 protons, 50 electrons

can be controlled in the laboratory

The nucleus of an atom is ____.

the central core and is composed of protons and neutrons

positively charged and has more protons than neutrons

negatively charged and has a high density

negatively charged and has a low density

Which of the following statements is NOT true?

Electrons are negatively charged and have a mass of 1 amu.

Protons have a positive charge.

The nucleus of an atom is positively charged.

Neutrons are located in the nucleus of an atom.

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is made to illustrate which of the following?

that in a copper penny, there is one atom for every person on Earth

The mass number of an element is equal to ____.

the total number of protons and neutrons in the nucleus

the total number of electrons in the nucleus

less than twice the atomic number

a constant number for the lighter elements

What does the number 84 in the name krypton-84 represent?

the sum of the protons and electrons

What happens in a chain reaction?

Products that start a new reaction are released.

Reactants that have two parts split.

Products that are radioactive are lost.

Radioactive reactants are deposited on control rods.

An unstable nucleus ____.

increases its nuclear mass by fission

neutral, with the number of protons equaling the number of electrons

positively charged, with the number of protons exceeding the number of electrons

negatively charged, with the number of electrons exceeding the number of protons

neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons

If an isotope decays by the process of beta emission, ____.

the number of neutrons remains the same

Unit 2 Atomic Structure Practice Test 2023

Authored by Elijah Batara

Science

11th Grade

NGSS covered

Unit 2 Atomic Structure Practice Test 2023

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

a positively charged subatomic particle

proton

nucleus

atom

electron

mass number

atomic mass unit

atomic number

atomic mass

isotope

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Unit 2 Atomic Structure Practice Test 2023

a positively charged subatomic particle

the smallest particle of an element that retains the properties of that element

a negatively charged subatomic particle

the central part of an atom, containing protons and neutrons

a subatomic particle with no charge

atoms with the same number of protons, but different numbers of neutrons in the nucleus of an atom

the weighted average of the masses of the isotopes of an element

the total number of protons and neutrons in the nucleus of an atom

one-twelfth the mass of a carbon atom having six protons and six neutrons

the number of protons in the nucleus of an element

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