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Biology Chap.2.1
Basic terms for Honors Biology, Grade 9
Question | Answer |
---|---|
Anything that occupies space and has mass | Matter |
The quantity of matter an object has | Mass |
Substances that cannot be broken down chemically into simpler kinds of matter | Element |
The simplest particle of an element that retains all of the properties of that element | Atom |
The central region of an atom that makes up the bulk of an atom and consists of two kinds of subatomic particles, protons and neutrons | Nucleus |
A positively charged subatomic particle | Proton |
A subatomic particle with no charge | Neutron |
The number of total protons of a single atom from an element | Atomic Number |
The number equal to the total number of protons and neutrons of an atom | Mass Number |
Negatively charged particles in an atom | Electron |
A three-dimensions; region around a nucleus that indicates the probable location of an electron | Orbital |
Atoms of the same element that have a different number of neutrons | Isotope |
When two or more atoms from different elements combine together in fixed porportions | Compound |
Attractive forces that hold atoms together | Chemical Bond |
A bond that forms when two atoms share one or more pairs of electrons | Covalent Bond |
The simplest part of a substance that retains all of the properties of that substance and can exist in a free state | Molecule |
An atom or molecule with an electrical charge | Ion |
The attraction between positive and negative electrical charges that cause them to bond | Ionic Bond |