Atomic Theory

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Why were Democritus's ideas not science?

They were not supported by experiment

The smallest piece of an element that still has the properties of that element is a(n) ____.

atom

The mass of a proton is measured in _____.

atomic mass units

Democritus believed that the universe is made of empty space and _____.

atoms

Aristotle believed that matter was _____.

capable of being broken down into infinitely smaller parts

A particle that moves around the nucleus is a(n) _____.

electron

The area around the nucleus where electrons are most likely to be found is called the _____.

electron cloud

The _____ of an atom is the number of neutrons plus protons.

mass number

A chemical symbol represents the ____ of an element.

name

Electrons have ____ charge.

negative

The nucleus of an atom is _____ charged.

positively

The number of which type of particle determines the identity of an element?

protons

What two subatomic particles are found in the center of an atom?

protons and neutrons

The atomic number of an element is the number of _____ of an atom of that element.

protons in the nucleus

Particles that make up protons and neutrons are called _____.

quarks

The atomic mass of an element is _____ of that element.

the average mass

What is the chemical symbol for carbon?

C

The first proposal that there is a smallest particle beyond which a substance cannot be divided was made by _____.

Democritus

Which scientist came up with the "plum pudding" model?

JJ Thomson

What 19th century scientist designed the atomic theory of matter?

John Dalton

Which of the following methods would be most useful for describing atoms?

Making a model

Who formed the first periodic table?

Mendeleev

What piece of technology was used to discover quarks?

A particle accelerator

A(n) _____ is matter that is composed of one type of atom.

element

An atom containing 6 protons and 6 electrons has a total charge that is _____.

neutral

Neutrons have _____ charge.

neutral

Is our modern atomic model 100% correct?

no

The middle of the atom is called the _____.

nucleus

The _____ is a chart created by scientists to organize the elements according to repeated changes of their properties.

periodic table

Protons have _____ charge.

positive


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