What is a small, positively-charged particle that is found in the nucleus of an atom?.

What is a small particle in the nucleus of the atom, with no electrical charge?

What is a tiny, negatively-charged particle that moves around the outside of the nucleus of an atom?

What is the basic particle from which all elements are made; the smallest particle of an element that has the properties of that element?

What is an atom with the same number of protons and a different number of neutrons from other atoms of the same element?

What is the central core of an atom, which contains protons and neutrons?

What is the average mass of all the isotopes of an element.?

What is an arrangement of the elements showing the repeating pattern of their properties?

What is a one- or two-letter abbreviation for an element?

What is a substance made of two or more elements chemically combined in a specific ratio or proportion?

What is the highest energy level of an atom and that are involved in chemical bonding?

What is a substance that can conduct electric current under some conditions?

What is an atom or group of atoms that has become electrically charged?

What is an ion that is made of more than one atom?

What is a neutral group of two or more atoms held together by covalent bonds?

What is a substance that tastes sour, reacts with metals and carbonates, and turns blue litmus red?

What is a reaction of an acid with a base, yielding a solution that is not as acidic or basic as the starting solutions were?

What is used to describe acids that react with some metals by wearing away the metal?

What is the measure of how much solute can dissolve in a given solvent at a given temperature?

What is a mixture containing small, undissolved particles that do not settle out?

Who discovered electrons?

Who discovered the nucleus of an atom?

Who suggested that electrons move only in specific orbits around an atom's nucleus?

Which reaction absorbs energy?

What is a reaction that releases energy, usually in the form of heat?

When no matter is allowed to enter or leave?

When matter can enter from or escape into its surroundings...

What is a change that alters the form or appearance of a material but does not make the material into another substance?

What is a change in which one or more substances combine or break apart to form new substances

What is a covalent bond in which electrons are shared unequally?

What is a covalent bond in which electrons are shared equally?