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22 Cards in this Set

  • Front
  • Back

How was Mendeleev's

periodic table arranged?

By increasing atomic mass

What are the two most

common alkaline

earth metals?

Calcium and Magnesium

More than half of of the

nonmetals are __________

at room temperature.


Bohr's Model

A model whose electron

orbits look like planets

orbiting the sun or layers

of an onion.

Family or group

A column of elements

in the periodic table.

What does the atomic

number of an element

stand for?

The number of protons

in the nucleus.

What are beta radiation

particles identical to?


What are Isotopes?

Atoms with the same

number of protons, but

different numbers

of neutrons.

What can you predict

from an element's

location on the

periodic table?

The element's properties

What elements generally

do not form compounds?

The noble gases

Name two ways that

protons and neutrons

are alike?

They have about the same

mass and both are found

in the nucleus.

What are three

properties of metals?

Metals are malleable,

ductile, and can carry

an electric current.

What are models?

Representations of an

idea to help scientists

understand what they

cannot directly observe.

Chemical Symbol

A one or two letter

representation of

an element.


To easily transmit

electricity and heat.


The spontaneous emission

of radiation by an unstable atomic nucleus.


The horizontal rows in

a periodic table.

On what side of the

periodic table are the

nonmetals located?

The right side of the

periodic table.

What is used to organize

the modern periodic table?

The atomic number

Why is the mass of an

electron not used in

determining the mass

of an atom?

The mass of an electron

is lower than the mass

of a proton or neutron and

will not make a big enough

difference to the total mass.

How can an atom have

no charge when it is made

of protons, neutrons

and electrons?

If an atom has the same

number of protons and

electrons; the negative

and positive charges

balance out and neutrons

have no charge.

Why is it not necessary

for electrons to be included

in determining the mass?

Since the mass of an electron

is smaller than protons or

neutrons it will not add

enough to the total mass

to make a difference.