bright-line spectrum and ground-state/excited state

In all atoms of bismuth, the number of electrons must equal the

• number of protons

• number of neutrons

• sum of the number of neutrons and protons

• difference between the number of neutrons and protons

Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-1

The bright-line spectra produced by four elements are represented in the diagram below.

• A and X

• A and Z

• D and X

• D and Z

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

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

• 2-8-6

• 2-7-7

• 2-8-7

• 2-7-8

Tags

NGSS.HS-PS1-1

Which notations represent atoms that have the same number of protons but a different number of neutrons

• H-3 and He-3

• Cl-35 and Cl-37

• S-32 and S-32

• Ga-70 and Ge-73

Which particles are found in the nucleus of an argon atom?

• protons and electrons

• positrons and neutrons

• protons and neutrons

• positrons and electrons

Compared to the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the

• first shell is lower

• first shell is the same

• third shell is lower

• third shell is the same

Tags

NGSS.HS-PS1-1

Which elements are present in the mixture

• G and J

• G and L

• M, J, and G

• M, J, and L

Tags

NGSS.HS-PS4-1

NGSS.HS-PS1-3

Which electron configuration represents an atom of chlorine in an excited state?

• 2-8-7-2

• 2-8-7

• 2-8-8

• 2-7-8

Tags

NGSS.HS-PS1-1

Atoms are neutral because the number of

• protons equals the number of neutrons

• protons equals the number of electrons

• neutrons is greater than the number of protons

• neutrons is greater than the number of electrons

Tags

NGSS.HS-PS1-7