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Elements
The Atom
Atomic No, Mass No, and Atomic Mass
Molecular and Ionic Compounds
Formulas of Compounds
100
A substance with only one type of atom.
What is an element?
100
The smallest particle of an element that retains the properties of that element.
What is an atom?
100

Of mass number, atomic mass, and atomic number, the one that uniquely identifies an element.

What is atomic number?

100
Of molecular and ionic compounds, the ones that generally have lower melting points.
What are molecular compounds?
100
The formula of the compound with one carbon atom and four hydrogen atoms.
What is CH4? (methane)
200
The number of elements found on Earth, rounded to the nearest hundred.
What is 100?
200
One of the four conclusions of Dalton's Atomic Theory.
What are any of: 1) Matter is composed of small, indivisible particles called atoms, 2) Atoms of the same element are identical and have the same properties, 3) Compounds are composed of atoms of different elements combined in small whole-number ratios, or 4) Reactions are merely the rearrangement of atoms into different combinations.
200

Of atomic number, atomic mass, and mass number, the only one that might not be a whole number.

What is the atomic mass?

200

The term given to two or more atoms covalently bonded, it can be either an element or a compound.

What is a molecule?

200
The number of electrons in the Li+ ion.
What is two?
300
An element that starts with the letter "B" (without using the periodic table).
What is any of boron, beryllium, barium, bismuth, bohrium, berkelium, or bromine.
300
Of the three subatomic particles, the one that is by far the least massive.
What is the electron?
300
The number of electrons in an atom of 45Sc.
What is 21 (same as number of protons).
300
The type of bond that holds a molecule together.
What is a covalent bond?
300
The formula unit of the compound formed from the Al3+ and phosphate ions.
What is AlPO4?
400

One example of an element that exists as a gas under standard conditions, i.e. room temperature and pressure of 1 atmosphere.

What is any of hydrogen, nitrogen, oxygen, fluorine, chlorine, helium, neon, argon, krypton, xenon, or radon.

400
The collective name given to protons and neutrons.
What is the nucleon?
400
The number of neutrons in an atom of 207Pb.
What is 207 - 82 = 125?
400

The names given to negatively- and positively-charged groups of atoms, respectively.

What are anion and cation?

400
The formula of the compound formed between the Be2+ ion and the N3- ion.
What is Be3N2?
500
The name of a particular molecular element that is typically composed of eight atoms.
What is sulfur?
500
The forces of attraction between unlike charges and forces of repulsion between like charges.
What are electrostatic forces?
500

The atomic mass of chlorine, if the percent abundance is 25% of one isotope with a mass of 34.00 amu and the only other isotope has a mass of 35.8 amu, rounded to the tenths and including the units.

What is 35.4 amus?

500
As opposed to molecules, ionic compounds are held together by electrostatic forces in a highly stable structure called this.
What is a lattice?
500
The formula of the compound formed between the ammonium ion and the carbonate ion.
What is (NH4)2CO3?