Regents Chemistry Unit 1

In an atom, an orbital represents

• the most probably location of a proton

• the most probable location of an electron

• the least probably location of a neutron

• photons emitted as electrons move to lower energy levels

Which particle has a mass so small, it is considered to be 0 amu?

• proton

• hydrogen nucleus

• neutron

• electron

During a flame test, sodium chloride produces an intense yellow flame. This yellow color is produced when electrons in excited atoms

• are gained by the atoms

• are lost by the atoms

• move to higher energy states within the atoms

• move to lower energy states within the atoms

Tags

NGSS.HS-PS1-2

What quantity is the same among atoms of the same element?

• mass number

• atomic number

• number of neutrons

• number of nucleons

An atom that has 8 protons and 10 neutrons is an isotope of the element

• nitrogen

• oxygen

• fluorine

• neon

Tags

NGSS.HS-PS1-8

What is the overall charge of an ion that has 9 protons, 11 neutrons, and 10 electrons?

• +1

• -1

• +2

• -2

Tags

NGSS.MS-PS1-1

Which electron configuration represents the atoms of a bromine atom in the excited state?

• 2-8-18-7

• 2-8-18-8

• 2-8-17-8

• 2-8-18-7-1

Tags

NGSS.HS-PS1-1

Which statement describe the location of protons and neutrons in an atom of helium?

• Protons and neutrons are in the nucleus

• Protons and neutrons are outside the nucleus

• Protons are outside the nucleus, and neutrons are in the nucleus

• Protons are in the nucleus, and neutrons are outside the nucleus

Tags

NGSS.MS-PS1-1

In the ground state, all atoms of Group 15 elements have the same number of

• valence electrons

• electron shells

• neutrons

• protons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which electron configuration represents the electrons of an atom in an excited state?

• 2-2

• 2-2-1

• 2-8

• 2-8-1

Tags

NGSS.HS-PS1-1