Atoms Unit Review Applied Chemistry

In the most modern model of the atom, electrons are found in

• orbits

• orbitals

• the nucleus

• outer space

One conclusion about the atom that came from the "Gold Foil Experiment" was

• There is a large, dense, negatively charged nucleus.

• The electron has a negative charge.

• There is a small, dense, positively charged nucleus.

• The nucleus consists of protons and neutrons.gogo

Which particles are found in the nucleus of an atom?

• Protons and Neutrons

• Protons and Electrons

• Neutrons and Electrons

• Protons and Positrons

An atom is electrically neutral because

• The number of protons equals the number of neutrons.

• The number of protons equals the number of electrons.

• The number of electrons equals the number of neutrons.

An atom has 15 protons and 16 neutrons. What is the atomic number and mass number of this atom?

• The atomic number is 16 and the mass number is 15.

• The atomic number is 15 and the mass number is 16.

• The atomic number is 15 and the mass number is 31.

• The atomic number is 16 and the mass number is 31.

Which particle is electrically neutral?

• Proton

• Neutron

• Electron

• Positron

Which two particles have a mass of approximately 1 u?

• Protons and Neutrons

• Protons and Electrons

• Electrons and Neutrons

• Protons and Positrons

The number of protons in the nucleus of a potassium atom is

• 39

• 15

• 19

• 31

What is the nuclear charge of a sodium atom?

• +23

• +16

• +11

• +32

As the number of neutrons in the nucleus increases, the nuclear charge of the atom

• increases

• decreases

• remains the same