Atoms, Elements, Molecules, and Compounds Flashcards
anything that has mass and takes up space
matter
the smallest part of a substance that has all the properties of a substance
atom
a positive charged particle found in the nucleus of an atom. It tells what type of atom it is.
proton
a particle in the nucleus of an atom with no charge; it is neutral
neutron
a negative charged particle found in the “shell” or “cloud” orbiting the nucleus
electron
a pure substance made up of only one type of atom
element
a table in which elements are arranged in order of the number of protons each atom contains
periodic table
a group of atoms joined together, it may be made up of atoms of one or more different elements
molecule
a substance whose molecules contain atoms of different elements
compound
the center of an atom which is made up of two smaller parts
nucleus
a short way of writing an element’s name
symbol
Does an element’s symbol always begin with a capital letter?
yes
the number of protons in one atom of an element.
atomic number
In the Periodic Table, are elements written in order of their atomic number?
yes
How many atoms are in one molecule of CO2
3
How many atoms are in one molecule of C4H12O4?
20
Name the three basic particles that make up an atom.
protons, electrons, and neutrons
Where is the nucleus located?
at the center of an atom
The number of neutrons affects the ___________and the radioactivity of the atom.
mass
When two atoms join together, they make a ____________________________
molecule
When atoms of different types of elements join together, they make molecules called ________________________.
compounds
Molecules and compounds are held together by forces called chemical _____________.
bonds
molecules are made up of more than one________________________
atom
Compounds are molecules that are made up of more than one _______
element
