chem test 1

An ion that consists of 7 protons, 9 neutrons, and 10 electrons has a net charge of

-3

Compounds are

2 or more elements chemically combined

What is the charge of the nucleus of a copper atom?

29

Temperature

A measure of the average kinetic energy of the molecules of a substance.

endothermic

Absorbs heat

Which emission causes the atomic number of a nuclide to decrease by 2 and its mass number to decrease by 4?

Alpha Particle

Any process that leads to the production of another element is called:

Transmutation

What cannot be broken down by chemical means?

an element

The elements on the Periodic Table of the Elements are arranged in order of increasing

atomic number

J.J. Tomson (1897)

cathode ray experiments, negatively charged particle, named electron

physical change

change in a substance that does not change its identity, no new substance

chemical change

changes in which new substances are formed

Elements cannot be decomposed by

chemical means

Two elements together make a-

compound

Becquerel

discovered radioactivity

a charged atom is called an

ion

Matter is anything that has ____ and takes up ____.

mass and take up volume

heterogeneous

more than one set of properties, of different kinds

The results of the gold foil experiment led to the conclusion that an atom is

mostly empty space and has a small, positively charged nucleus

Atoms are neutral when the number of

protons equals the number of electrons

An unstable nucleus spontaneously releases a positron. This is an example of

radioactive decay

Ernest Rutherford

realized that atom was mostly empty space and had a small positively charged nucleus

proton identified by :

rutherford

mixtures are

substances that are physically but not chemically combined

ionizing power

the ability of radiation to damage molecules (molecules lose electrons)

penatrating power

the ability of radioactive particles to move through material

Two atoms that are different isotopes of the same element have-

the same number of protons but a different number of neutrons.

A change in the nucleus of an atom that converts the atom from one element to another element is called

transmutation

homogeneus

uniform throughout

John Dalton

Englishman, proposed an atomic theory

Democritus

Greek philosopher small indivisible particle called atoms

Which statement describes the location of protons and neutrons

Protons and neutrons are in the nucleus.

exothermic

Releases heat