2024-25 Atomic Structure 낱말 카드 | Quizlet

Atom

a unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons.

Proton

a subatomic particle with a positive charge located in the nucleus of an atom and has a mass of 1 amu (atomic mass units).

Neutron

a subatomic particle with a neutral charge located in the nucleus of an atom and has a mass of 1 amu (atomic mass units).

Electron

A subatomic particle that has a negative charge

Atomic mass unit (amu)

a unit of mass equal to one-twelfth the mass of a carbon-12 atom

Nucleus

the central part of the atom housing the protons and neutrons.

Atomic number

the number of protons in an atomic nucleus.

Isotope

Atoms of the same element that have different numbers of neutrons and a different Mass Number

Subatomic Particles

Protons, neutrons and electrons

average atomic Mass

the average mass of all the different isotopes that make up the element. The average is calculated using the relative abundance of isotopes in a naturally occurring element.

Mass Number

the sum of the number of neutrons and protons in an atomic nucleus

Nuclear Symbol

The superscript indicates the mass number and the subscript indicates the atomic number

electron cloud

a region around the nucleus of an atom where electrons are likely to be found

hyphen notation

the mass number is written with a hyphen after the name of the element

nucleon

Any subatomic particle found in the atomic nucleus. Another name for either a proton or a neutron.

subscript

A text format where text is written slightly below the surrounding text

superscript

A text format where text is raised and smaller than surrounding text.

ion

An atom or group of atoms that has a positive or negative charge.

anion

an ion with a negative charge

cation

an ion with a positive charge

isotope

Atoms of the same element with different numbers of neutrons