Structure of Atoms
More on Atoms
Periodic Table
Representative Groups
Chemical Bonds
100

One of the first people to state that matter is made up of atoms was this man.

Who is Democritus?

100

Almost all of the mass of an atom is located in its ______.

What is nucleus?

100
In the modern periodic table, elements are arranged by ________ atomic number (# of protons).
What is increasing?
100

Elements in a group have similar properties because they have the _____ number of valence electrons.

What is same?

100

When the highest occupied enery level of an atom is filled with electrons, the atom is _______, and not likely to react.

What is stable?

200

Dalton's model of an atom is best described as a ______ sphere.

What is solid?

200

Which particle is the least massive? (proton, electron, or neutron)

What is electron?

200
DOUBLE JEOPARDY! A __________ electron is an electron that is in the highest occupied energy level of an atom.
What is valence?
200

DOUBLE JEOPARDY! Copper is an example of this kind of metal.

What is transition?

200

DOUBLE JEOPARDY! An atom that has a net positive or negative electric charge is called an ___.

What is an ion?

300

This scientist provided thet first evidence that atoms contain subatomic particles.

Who is Thomson?

300

The number of neutrons in an atom equals the mass number (protons+neutrons) minus the __________.

What is atomic number? (# of protons as well as # of electrons)

300
An atom has 29 protons, 29 electrons, and 35 neutrons. What is the mass number of the atom?
What is 64? (mass # = protons + neutrons)
300

These metals are the most reactive.

What is alkali metals?

300
An ion with a negative charge is an ______; an ion with a positive charge is a _______.
What is anion and cation?
400

All atoms of an element have the same _____ ______.

What is the atomic number? (which is the # of protons and also the # of electrons)

400

Atoms emit energy as light when some electrons move to _________ energy levels.

What is lower energy levels?

400
Which accounts for most of the mass of an atom? (electrons, protons, neutrons+protons, electrons+neutrons)
What is neutrons + protons?
400
The noble gases are colorless and ____________, and extememly nonreactive. Helium has 2 valence electrons and the other noble gases have _____ valence electrons.
What is odorless, 8?
400

In this type of chemical bond, two atoms share a pair of valence electrons.

What is covalent?

500

A electron is a particle with a ______ charge, found _______ the nucleus.

What is negative, outside?

500
In Bohr's model, electrons move with constant speed in fixed orbits around the nucleus, like _______________.
What is planets around the sun?
500
Across a period from left to right, the elements become _____ metallic and _____ nonmetalic in their properties.
What is less metallic and more nonmetalic?
500
This is the most abundant element in the Earth's crust and has its own family in the periodic table.
What is Oxygen?
500
This is a type of covalent bond in which electrons are not shared equally.
What is polar covalent?
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