Science Chapter 6 Study Guide

In 1911, Ernest Rutherford proposed that each atom has a ____________. (small/dense/positive)

The sum of the protons and neutrons in an atom is called the _______________.

Most of an atom's mass is found in the ____________.

the number of protons in the nucleus of an atom

Objects are pulled toward one another by ____________________ force.

In Thomson's plum-pudding model of the atom, the plums represent

particle in the center of an atom that has no charge

What did Democritus, Thomson, Rutherford, and Bohr all have in common?

Electrons around the nucleus are held in place by _______________________ force.

The region in an atom that contains most of the mass is called the...

A positively charged particle in the nucleus of an atom is...

All atoms of an element have the same ________________.

the sum of protons and neutrons in an atom

What is the smallest particle into which element can be divided and still be the same substance

negatively charged particle discovered by Thomson

Around 440 BCE, Democritus proposed the idea of an __, a particle that could not be cut in half

The weighted average of all the naturally occurring isotopes of an element is called the...

subatomic particle that has a positive charge.

Isotopes have different numbers of...

20th century scientists believe electrons are found in regions called...

Protons stay together in the nucleus because of _________________ force.

In 1803 John Dalton proposed that all substances are made of...

A charged particle is called a(n) _______________.

Atoms that are _________________ of each other are always the same element.

Neutrons and _________ each have a mass of about 1 amu.

An atom of an element with the same number of protons but different amount of neutrons is...

"cannot be divided"

a unit of mass that describes the mass of an atom or molecule

Because the mass of a(n) ___________ is so small, it is usually thought of as almost zero.

region where electrons are likely to be found

The smallest particle into which an element can be divided into and still be the same substance

AN atom of gold with 79 protons, 79 electrons, and 118 neutrons would have a mass number of...

Atoms that are _________________ of each other are always the same element.

Which of the following has the least mass?

central region of the atom

The smallest particle which can be divided and still be same substance

atom that has the same number of protons but different number of neutrons

The pushes and pulls between objects are called...

A hydrogen atom with one proton in its nucleus has an ___________________ that is 1.

The number of protons in an atom determines its...