Atoms

The smallest piece of matter was named "atom" by _____.
1. Socrates
2. Nero
3. Democritus
4. Hippocrates
The electron was discovered by _____.
1. John Dalton
2. J.J. Thomson
3. Ernest Rutherford
4. Niels Bohr
Bohr's atomic model placed the electrons _____.
1. in the nucleus
2. in definite orbits around the nucleus
3. in no definite position
4. scattered among the positive charges
Almost all the mass of an atom is found _____.
1. outside the nucleus
2. in the electron cloud
3. in the energy levels
4. in the nucleus
The nucleus of an atom contains _____.
1. protons and electrons
2. protons and neutrons
3. electrons and neutrons
4. only neutrons
The atomic number of an element indicates the _____.
1. sum of protons plus neutrons
2. sum of protons plus electrons
3. number of protons
4. number of neutrons
The atomic number of magnesium is 12. Its nucleus must contain _____.
1. 6 protons and 6 neutrons
2. 6 neutrons and 6 electrons
3. 12 protons and no electrons
4. 12 neutrons and no protons
The atomic number of hydrogen is 1. Its nucleus must contain _____.
1. 1 proton and 1 electron
2. 1 proton only
3. 1 electron only
4. 1 neutron only
An element has an atomic number of 4 and atomic weight (mass) of 9. The number of neutrons in the nucleus of this atom is _____.
1. 2
2. 3
3. 4
4. 5
The word atom comes from the Greek word atomos, meaning _____.
1. matter
2. indivisible
3. mass
4. volume
All neutrons _____.
1. are electrically neutral
2. have a mass of 2 amu
3. are electrically positive
4. are located outside the nucleus
Indirect evidence about an object is evidence gathered _____.
1. by reading a textbook
2. without actually seeing or touching the object
3. without any experimenting
4. that cannot be used in a theory
The central portion of an atom is called the _____.
1. nucleus
2. core
3. element
4. atomsphere
The mass (or weight) of subatomic particles is measured by a special unit called the _____.
1. aclu
2. pii
3. ion
4. amu
The Greek word atomos means _____.
1. mass
2. atmosphere
3. invisible
4. cannot be divided
The number of protons in an element, also called it _____, identifies the element.
1. charge
2. atomic number
3. nucleus
4. mass
The subatomic particle that has a neutral charge is the _____.
1. electron
2. neutron
3. proton
4. neuron
In an atom, electrons are found in an area known as the _____.
1. neutronic membrane
2. biosphere
3. electron cloud
4. nucleus
In an uncharged atom, the number of protons and _____ must be equal.
1. electrons
2. ions
3. neurons
4. particles
The _____ make(s) up about 99.9% of the mass of the atom.
1. amu
2. atomic number
3. electron cloud
4. nucleus
The 1st energy level of an atom can hold _____ electrons.
1. 2
2. 4
3. 6
4. 8
The 2nd energy level of an atom can hold _____ electrons.
1. 4
2. 6
3. 8
4. 12
The 3rd energy level of an atom can hold _____ electrons.
1. 8
2. 12
3. 16
4. 18
The 4th energy level of an atom can hold _____ electrons.
1. 16
2. 18
3. 32
4. 36
Nitrogen: Atomic # = 7
# of neutrons = 7

Which of the following is an accurate illustration of a nitrogen atom?
Neon: Atomic # = 10
# of neutrons = 10

Which of the following is an accurate illustration of a nitrogen atom?

Atoms

Multiple-Choice Exercise

Author of Activity: Tami Maloney; Content: Leslie Pentecost © 2006; All rights reserved. E-mail comments and questions to Tami Maloney.

The smallest piece of matter was named "atom" by _____.

The electron was discovered by _____.

Bohr's atomic model placed the electrons _____.

Almost all the mass of an atom is found _____.

The nucleus of an atom contains _____.

The atomic number of an element indicates the _____.

The atomic number of magnesium is 12. Its nucleus must contain _____.

The atomic number of hydrogen is 1. Its nucleus must contain _____.

An element has an atomic number of 4 and atomic weight (mass) of 9. The number of neutrons in the nucleus of this atom is _____.

**The word atom comes from the Greek word atomos, meaning _____.**

All neutrons _____.

Indirect evidence about an object is evidence gathered _____.

The central portion of an atom is called the _____.

The mass (or weight) of subatomic particles is measured by a special unit called the _____.

**The Greek word atomos means _____.**

The number of protons in an element, also called it _____, identifies the element.

The subatomic particle that has a neutral charge is the _____.

In an atom, electrons are found in an area known as the _____.

In an uncharged atom, the number of protons and _____ must be equal.

The _____ make(s) up about 99.9% of the mass of the atom.

The 1st energy level of an atom can hold _____ electrons.

The 2nd energy level of an atom can hold _____ electrons.

The 3rd energy level of an atom can hold _____ electrons.

The 4th energy level of an atom can hold _____ electrons.

Nitrogen: Atomic # = 7
# of neutrons = 7

Which of the following is an accurate illustration of a nitrogen atom?

Neon: Atomic # = 10
# of neutrons = 10

Which of the following is an accurate illustration of a nitrogen atom?

Atoms

Multiple-Choice Exercise Author of Activity: Tami Maloney; Content: Leslie Pentecost © 2006; All rights reserved. E-mail comments and questions to Tami Maloney.

The smallest piece of matter was named "atom" by _____.

The electron was discovered by _____.

Bohr's atomic model placed the electrons _____.

Almost all the mass of an atom is found _____.

The nucleus of an atom contains _____.

The atomic number of an element indicates the _____.

The atomic number of magnesium is 12. Its nucleus must contain _____.

The atomic number of hydrogen is 1. Its nucleus must contain _____.

An element has an atomic number of 4 and atomic weight (mass) of 9. The number of neutrons in the nucleus of this atom is _____.

The word atom comes from the Greek word atomos, meaning _____.

All neutrons _____.

Indirect evidence about an object is evidence gathered _____.

The central portion of an atom is called the _____.

The mass (or weight) of subatomic particles is measured by a special unit called the _____.

The Greek word atomos means _____.

The number of protons in an element, also called it _____, identifies the element.

The subatomic particle that has a neutral charge is the _____.

In an atom, electrons are found in an area known as the _____.

In an uncharged atom, the number of protons and _____ must be equal.

The _____ make(s) up about 99.9% of the mass of the atom.

The 1st energy level of an atom can hold _____ electrons.

The 2nd energy level of an atom can hold _____ electrons.

The 3rd energy level of an atom can hold _____ electrons.

The 4th energy level of an atom can hold _____ electrons.

Nitrogen: Atomic # = 7# of neutrons = 7Which of the following is an accurate illustration of a nitrogen atom?

Neon: Atomic # = 10# of neutrons = 10Which of the following is an accurate illustration of a nitrogen atom?

Multiple-Choice Exercise

Author of Activity: Tami Maloney; Content: Leslie Pentecost © 2006; All rights reserved. E-mail comments and questions to Tami Maloney.

**The word atom comes from the Greek word atomos, meaning _____.**

**The Greek word atomos means _____.**

Nitrogen: Atomic # = 7
# of neutrons = 7

Which of the following is an accurate illustration of a nitrogen atom?

Neon: Atomic # = 10
# of neutrons = 10

Which of the following is an accurate illustration of a nitrogen atom?