Atomic Concepts

Isotopes of elements must have different

• atomic numbers

• mass numbers

• number of protons

• number of electrons

The nuclides I-131 and I-133 are classified as

• isomers of the same element

• isomers of Xe-131 and Cs-133

• Isotopes of the same element

• isotopes of Xe-131 and Cs-133

Tags

NGSS.HS-PS1-8

The nucleus of an atom of cobalt-58 contains

• 27 protons and 31 neutrons

• 27 protons and 32 neutrons

• 59 protons and 60 neutrons

• 60 protons and 60 neutrons

Tags

NGSS.HS-PS1-8

Which notations represent different isotopes of the element sodium?

• ³²S and ³⁴S

• S^2- and S⁶⁺

• Na⁺ and Na⁰

• ²²Na and ²³Na

What is the number of electrons in a potassium atom?

• 18

• 19

• 20

• 39

Which statement describes the charge of an electron and the charge of a proton?

• An electron and a proton both have a charge of +1.

• An electron and a proton both have a charge of -1.

• An electron has a charge of +1, and a proton has a charge of -1.

• An electron has a charge of -1, and a proton has a charge of +1.

Tags

NGSS.HS-PS3-5

Compared to the charge of a proton, the charge of an electron has

• the same magnitude and the same sign

• the same magnitude and the opposite sign

• a greater magnitude and the opposite sign

• a greater magnitude and the same sign

An element that has gained more neutrons than the original atom

• Polar Molecules

• Nonpolar Molecules

• Ion

• Isotope

Tags

NGSS.HS-PS1-8

An element that gains or loses electrons

• isotope

• Ion

• Covalent Molecule

• Colligative

Tags

NGSS.HS-PS1-2

What is the mass number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Tags

NGSS.HS-PS1-8