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Chapter 1 Review

Atoms And Molecules

Anything that has mass and takes up space is ___. matter
A small particle that is the building clock of matter is ___. atom
Matter with a composition that is always the same is ___. substance
A substance made of only one kind of atom is a ___. element
Two or more atoms that are held together by chemical bonds and act as a unit is called ___. molecule
A substance mode of two or more elements that are chemically joined in a specific combination is called ___. compound
Matter that can vary in composition is called ___. mixture
A mixture in which the substance are not evenly mixed is a ___ mixture. heterogeneous
A mixture in which two or more substances are evenly mixed, but not bonded together is a ___ mixture. homogeneous
The region at the center of an atom that contains most of the mass of the atom is the ___. nucleus
A positively charged particle in the nucleus of an atom is the ___. proton
An uncharged particle in the nucleus of an atom is the ___. neutron
A negatively charged particle that occupies the space in an atom outside the nucleus is the ___ electron
___ is the region surrounding an atom's nucleus where one or more electrons are most likely to be found. electron cloud
___ is the number of protons in the nucleus of an atom of an element. atomic number
One or two more atoms of an element having the same number of protons, but a different number of neutrons is the ___. isotope
___ is an atom that has a charge because it has gained or lost electrons. ion
The nucleus of an atom contains (protons/electrons) and neutrons. protons
The nucleus has a (positive charge/negative charge) and the (least mass/most mass) of the atom. positive charge: most mass
An electron is a (positively charged/negatively charged) particle located outside the nucleus. negatively charged
The modern model of an atom is called the (electron cloud/nucleus orbit) model. electron cloud
Electrons that are close to the nucleus have (more energy/less energy) than electrons that are farther from the nucleus. more energy
The atomic number is the number of (protons/neutrons) in the nucleus of an atom of an element. protons
Isotopes have the same number of protons but different numbers of (electrons/neutrons). neutrons
An ion has a charge because it has gained or lost (protons/electrons). electrons
A (positive/negative) ion has more protons than electrons. positive
Adding a(n) (proton/electron) to a neutral atom produces a new element. proton
Created by: weberash2711