Download presentation
Presentation is loading. Please wait.
Published byFelicity Bradley Modified over 9 years ago
1
TOPIC 1 vocabulary
2
ATOM Smallest part of an element that can enter into a chemical reaction
3
ATOMIC MASS Average mass of all the isotopes of a sample of an element
4
ATOMIC MASS UNIT 1/12 the mass of a carbon-12 atom
5
ATOMIC NUMBER Number of protons in the nucleus of an atom
6
COMPOUND Two or more elements chemically combined in definite proportion by mass
7
ELECTRON Fundamental particle of matter having a negative charge
8
ELEMENT Substance that cannot be broken down or decomposed into a simpler substance by chemical means
9
EXCITED STATE Condition that exists when electrons of an atom occupy higher energy levels, leaving lower energy level(s) vacant
10
GROUND STATE Condition of an atom or ion in which electrons occupy the lowest possible energy levels
11
HETEROGENEOUS Mixture in which substances are not uniformly distributed
12
HOMOGENEOUS Mixture in which substances are uniformly distributed
13
ISOTOPE Atom of an element with a specific (sometimes unusual) number of neutrons with the protons
14
MASS NUMBER protons + neutrons
15
MIXTURE Two or more substances not chemically combined
16
NEUTRON Particle in the nucleus of an atom with no charge (neutral)
17
NUCLEUS Dense, positively charged, central core of an atom
18
ORBITAL Region in an atom (outside the nucleus) where an electron with a specific amount of energy is most likely to be located
19
PROTON Positively charged particle in the nucleus of an atom
20
PURE SUBSTANCE Material with the same composition throughout; an element or compound
21
VALENCE Outermost energy level around an atom
22
WAVE-MECHANICAL MODEL Current model of the atom in which electrons exist in orbitals of various shapes and pathways, called the electron cloud
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.