Honors Chemistry Unit 2 Test Fall 2024

A positively charged particle with mass 1.673 x 10^-27 g is a(n)

• proton

• neutron

• electron

• positron

A nuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)

• nuclide

• neutron

• electron

• isotope

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NGSS.HS-PS1-8

An atom is electrically neutral because

• neutrons balance the protons and electrons.

• nuclear forces stabilize the charges.

• the numbers of protons and electrons are equal.

• the numbers of protons and neutrons are equal.

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NGSS.MS-PS1-1

Isotopes are atoms of the same element that have different

• principal chemical properties.

• numbers of neutrons.

• numbers of protons.

• numbers of electrons.

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NGSS.HS-PS1-8

The atomic number of oxygen, 8, indicates that there are eight

• protons in the nucleus of an oxygen atom.

• oxygen nuclides.

• neutrons outside the oxygen atom's nucleus.

• energy levels in the oxygen atom's nucleus.

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NGSS.MS-PS1-1

All atoms of the same element have the same

• atomic mass

• number of neutrons

• mass number

• atomic number

Chlorine has atomic number 17 and mass number 35. It has

• 17 protons, 17 electrons, and 18 neutrons.

• 35 protons, 35 electrons, and 17 neutrons.

• 17 protons, 17 electrons, and 52 neutrons.

• 18 protons, 18 electrons, and 17 neutrons.

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NGSS.HS-PS1-1

A spherical electron cloud surrounding an atomic nucleus would best represent

• an s orbital.

• a px orbital.

• a combination of px and py orbitals.

• a combination of an s and a px orbital.

The number of orbitals for the d sublevel is

• 1

• 3

• 5

• 7

For the f sublevel, the number of orbitals is

• 5

• 7

• 9

• 18