Aug 2022 Chemistry Regents

What is the number of protons in an atom with the electron configuration of 2–5?

• 5

• 2

• 3

• 7

Tags

NGSS.HS-PS1-1

In the wave-mechanical model of an atom, an orbital is defined as

• a region of the most probable neutron location

• a region of the most probable electron location

• the straight-line path of a neutron

• the straight-line path of an electron

In the ground state, which shell of a potassium atom has an electron with the greatest amount of energy?

• first

• second

• third

• fourth

Tags

NGSS.HS-PS1-1

Which phrase describes two atoms that contain the same number of protons but a different number of neutrons?

• ions of the same element

• isotopes of the same element

• a mixture of different elements

• nuclides of different elements

All atoms of an element have the same

• mass number

• atomic mass

• number of neutrons

• number of protons

Which Group 15 element is classified as a metal?

• N

• P

• As

• Bi

Tags

NGSS.HS-PS1-1

Compared to the number of electron shells and radius of an aluminum atom in the ground state, a boron atom in the ground state has

• fewer electron shells and a smaller radius

• fewer electron shells and a larger radius

• more electron shells and a smaller radius

• more electron shells and a larger radius

Tags

NGSS.HS-PS1-1

Hydrogen sulfide, H₂S, is classified as a

• compound with atoms in a fixed proportion

• compound with atoms in a proportion that can vary

• mixture with atoms in a fixed proportion

• mixture with atoms in a proportion that can vary

A structural formula differs from a molecular formula in that a structural formula shows the

• arrangement of atoms

• number of atoms

• ratio of atoms

• types of atoms

Tags

NGSS.MS-PS1-1

Which type of reaction occurs when a compound is separated into its elements?

• synthesis

• decomposition

• single replacement

• double replacement