Atoms Review

How much effect do commonly found isotopes have on the average atomic mass of an element?

In _________ atomic model, negative electrons orbit the positively charged nucleus.

Two different isotopes of an element have different

What is the mass number of an element with 19 p⁺, 19 e^-, and 20 n⁰?

Which of the following is not a type of orbital?

The charge of an atom is

Avogadro's number is useful for

Thomson is responsible for discovering that an atom contains

Democritus's original atomic theory was revised because it

Who determined that atoms could be divided?

What is the mass of 2.5 mol of Ca? (mm = 40 g/mol)

An iron atom has a mass # of 56. Its atomic # is 26. How many neutrons does it have?

An element's atomic number is equal to its number of

What is the amount of nickel present in 525 g? (mm = 58.7 g/mol)

Which of the following is a unit or quantum of light?

Thomson made his discovery about the atom during an experiment using

A subatomic particle that has a negative charge is called a(n)

The number of energy levels filled in an atom is determined by

Whose model determined that an atom's positive charge is concentrated in the atom's center?

Which of the following is what happens to an electron when it gains energy?

Which of the following statements is not true?

A sodium atom, which has 11 e^-, has _____ e^- in its third energy level.

Which of the following is where electrons are likely to be found in an atom?

which of these statements is not a part of Dalton's atomic theory?

Which of the following is found in the outer energy level of an atom?

Which of the following statements is not true?

what is the molar mass of an element with an avg. atomic mass of 9.012 u?

Unlike the modern model of the atom, Bohr's model states that

what is an atom's nucleus made of?

An electron jumps to a new energy level when