Chemistry and physics

Chemistry and physics
alkali metals - correct answergroup 1

alkaline earth metals - correct answerthe elements in Group 2A of the periodic table

atomic number - correct answerthe number of protons in the nucleus of an atom

chemical change - correct answerA change in matter that produces one or more new
substances

covalent bond - correct answerA chemical bond that involves sharing a pair of electrons
between atoms in a molecule

Density - correct answerMass / Volume

Electron - correct answerNegative charge

Halogen - correct answerAn element found in group 17 of the periodic table

ionic bonds - correct answerformed when one or more electrons are transferred from
one atom to another

mass number - correct answerthe sum of the number of neutrons and protons in an
atomic nucleus

Metal - correct answerElements that are good conductors of heat and electric current.

Mixture - correct answerTwo or more substances that are mixed together but not
chemically combined

Molecule - correct answerA group of atoms bonded together

Neutron - correct answerA subatomic particle that has no charge and that is found in the
nucleus of an atom

Nonmetals - correct answerElements that are poor conductors of heat and electric
current

Nuclues - correct answercenter of an atom made of protons and neutrons

physical change - correct answerA change in a substance that does not involve a
change in the identity of the substance

Proton - correct answerPositive charge