Fall Semester review 2024

Front

What particle in the atom has no charge and a mass of 1?

Back

Neutrons are subatomic particles found in the nucleus of an atom, with no electric charge and a mass approximately equal to 1 atomic mass unit.

Front

How many neutrons does the isotope of lithium have if it has a mass number of 8?

Back

The isotope of lithium with a mass number of 8 has 5 neutrons (8 - 3 protons = 5 neutrons).

Front

How many electrons does silicon (Si) contain?

Back

Silicon (Si) has 14 electrons, which is equal to its atomic number.

Front

What is the empirical formula for a compound with 40.05% sulfur (S) and 59.95% oxygen (O)?

Back

The empirical formula is SO3, which corresponds to sulfur trioxide.

Front

What is the formula for potassium oxide formed from K+ and O-2 ions?

Back

The formula for potassium oxide is K2O.

Front

Define atomic number.

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity.

Front

What is the difference between an ion and an atom?

Back

An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net charge, while an atom is neutral with equal numbers of protons and electrons.

Front

What is the significance of the mass number of an element?

Back

The mass number is the total number of protons and neutrons in an atom's nucleus, indicating the atom's isotopes.

Front

What is the formula for calculating the number of neutrons in an atom?

Back

Number of neutrons = Mass number - Atomic number.

Front

What is an empirical formula?

Back

An empirical formula represents the simplest whole-number ratio of elements in a compound.