1.5 - Chemistry Quiz 1 Review

Flashcards for Chemistry Quiz 1 Review covering atomic neutrality, isotope calculations, Bohr's model of the atom, and Material Safety Data Sheet information.

Why is an atom considered neutral?

An atom is neutral because it has an equal number of positive and negative charges (protons and electrons).

What types of safety information are found in a Material Safety Data Sheet?

Chemical hazards, safe work practices, and emergency response across $16$ standard sections.

What is an isotope?

A variant of a chemical element that has the same number of protons but a different number of neutrons.

According to Bohr's model of the atom, how many electrons can exist in the first energy level?

$2$ electrons

According to Bohr's model of the atom, how many electrons can exist in the second energy level?

$8$ electrons

For the isotope hydrogen-3 (tritium), what are its mass number, number of protons, and number of neutrons?

For cobalt-60 ($^{60}_{27}\text{Co}$), what are its mass number, number of protons, and number of neutrons?

Mass number: $60$, Number of protons: $27$, Number of neutrons: $33$

For nitrogen-15, what are its symbol, mass number, number of protons, and number of neutrons?

Symbol: $^{15}_7\text{N}$, Mass number: $15$, Number of protons: $7$, Number of neutrons: $8$

For uranium-238 ($^{238}_{92}\text{U}$), what are its mass number, number of protons, and number of neutrons?

Mass number: $238$, Number of protons: $92$, Number of neutrons: $146$

For iodine-129 ($^{129}_{53}\text{I}$), what are its mass number, number of protons, and number of neutrons?

Mass number: $129$, Number of protons: $53$, Number of neutrons: $76$

If an atom has $56$ protons and $79$ neutrons, what is its mass number?

$$135$$

If an isotope has a mass number of $86$ and $48$ neutrons, how many protons does it have?

$38$ protons