Science: Module 3 Quiz

The nuclei of isotopes contain different numbers of _______________.

An electron has the same amount of energy in every orbital

If an atom of gallium has a mass number of 68 and an atomic number of 31 how many neutrons are in its nucleus?

In the nucleus of an atom, there are 17 protons and 18 neutrons. How many electrons are there?

Which group of elements on the periodic table are the most reactive?

Which of the following is NOT part of John Dalton's atomic theory?

An atom's lowest energy level has only one orbital

What does the Law of Conservation of Mass state?

Who was the first to argue that all matter was made from indivisible particles called atoms?

Which statement about subatomic particles is NOT true?

In the nucleus of an atom, there are 17 protons and 18 neutrons. What is the atomic mass?

There are more electrons in the orbitals of an atom than there are protons in the nucleus of the atom.

What are the rows and columns of the periodic table called?

Which of the following is unique for each element?

An electron cloud represents all the orbitals in an atom

In Rutherford's atomic model with a nucleus, the positive charge is

Sodium chloride (table salt) is a compound of sodium (1 valence electron). What group does it belong to?

In the nucleus of an atom, there are 17 protons and 18 neutrons. What is the atomic #?

What determines an element's chemical properties?

An orbital can contain a maximum of two electrons

Which subatomic particle has a negative charge?

Which of the following is true about the difference between an atom in the ground state & an atom in an excited state?

Chlorine has 7 valence electrons. Which group does it belong to?