The subatomic particles that make up atoms are:
protons, neutrons, and electrons
main types of chemical bonds
covalent and ionic bonds
all isotopes of an element:
same chemical properties because they have same number of electrons
the basic unit of matter
the center of the atom which contains the protons and neutrons; in cells, structure that contains the cell's genetic material (DNA) and controls the cell's activities
negatively charged particle; outside nucleus
a pure substance made of only one kind of atom
atoms of the same element but with a different number of neutron
substance formed by the chemical combination of two or more elements in definite proportions
Formed when one or more electrons are transferred from one atom to another
positively and negatively charged atoms
A chemical bond formed when two atoms share electrons
smallest unit of most compounds; structure that results when atoms are joined together by covalent bonds
van der Waals forces
a slight attraction that develops between the oppositely charged regions of nearby molecules
positive; inside the nucleus
neutral; inside the nucleus
Why are atoms neutral despite having charged particles?
Because atoms have equal numbers of electrons and protons, and because these subatomic particles have equal but opposite charges.
What does an element's atomic number represent?
It represents how many protons and electrons there are.
How are isotopes identified?
By their mass numbers.
What holds atoms in compounds together?
an atom that gains electrons has a:
In a covalent bond, atoms share electrons.
When atoms share two electrons, it is called a double bond.
In a water molecule, each hydrogen atom forms a single covalent bond.
Atoms can share six electrons and form a triple bond.