1.
ACCELERATION : The rate at which an object changes its velocity over time.
2.
ISOTOPE : Atoms of the same element with different numbers of neutrons.
3.
VALENCY : The combining power of an element to form chemical bonds.
4.
INERTIA : The resistance of an object to a change in its state of motion.
5.
MOMENTUM : The product of an object's mass and velocity; determines motion impact.
6.
CATALYST : A substance that speeds up a chemical reaction without being changed itself.
7.
FUSION : The process of combining two atomic nuclei to form a heavier nucleus.
8.
DENSITY : The mass per unit volume of a substance; how compact matter is.
9.
IONIZATION : The process of gaining or losing electrons to form ions.
10.
RADIATION : The emission of energy as electromagnetic waves or particles.
