Science - Structure Of Matter Part 1 Study Guide For Lessons 5 - 6

The atomic mass of hydrogen is _______

1

The inner orbit is designated by the number .

1

How many times greater is the mass of a proton than the mass of an electron?

1,800 times

The first shell can hold a maximum of_________electrons.

2

The greatest number of electrons possible in the inner shell is

2

electron

an atomic particle with a negative charge

Electrons are located only in specific shells around the ________________?

atom

The smallest possible part of an element that can still be identified as the element is called a(n)

atom

the number of protons in an atom; a number unique to each element

atomic number

drew first picture of atom

Niels Bohr

The shell closest to the nucleus is called the _____.

inner shell

Each shell surrounding an atom is_________________ in the number of electrons it can have.

limited

approximately, the number of protons plus neutrons in an atom

atomic mass

A molecule is made up of two or more chemically bonded atoms.

True

Electrons have almost no mass.

True

Electrons have_______________charge.

a negative

compound

a union of two or more different elements in definite proportion by mass

Atomic particles that orbit the nucleus are the

electrons

a substance made up of only one kind of atom

element

the path in which an electron travels around the atom

orbital

The paths in which electrons travel are called

orbitals

an atomic particle which is positively charged and found in the nucleus

proton

The three main particles of an atom are the:

proton electron neutron

The atomic number is equal to the number of _____.

protons

The atomic number tells how many____________are in the nucleus.

protons

The atomic mass of an atom equals the sum of the masses of the _____.

protons and neutrons

the combining power of an atom

valence

Electrons in the outer shell are called _____.

valence electrons

A molecule of water is made up of _____.

3 atoms

Atomic theory was proposed by the English chemist

Dalton

Each shell is limited to a maximum of four electrons.

False

Neutrons have a negative electrical charge.

False

Protons orbit the nucleus.

False

The valence of an atom is determined by the nucleus.

False

a positive or negative electrical quality

charge

The shell farthest from the nucleus would be _____.

n = 7

inner orbit

n=1 shell

The particle that determines the mass of the atom, along with the proton, is the .

neutron

an atomic particle that has no charge and is found in the nucleus

neutron

the center of the atom

nucleus

An atom has no electrical charge because _____.

the number of protons is equal to the number of electrons

Each shell surrounding an atom is limited in the number of electrons it can have.

true