HSC Unit 2 - Atomic Theory, Atoms & The Periodic Table

The mass of an element is equal to the

He discovered the nucleus of an atom utilizing the gold foil experiment.

____ discovered the electron using a cathode ray tube.

To calculate the average atomic mass, you must move the decimal point in the percent abundance two places to the left.

The noble gases include elements such as

Which of the following would you predict is the most common isotope of beryllium?

Elements in Group 17 are also known as the ____________.

The elements in Groups 3-12 are known as the noble gases.

Which of the following is located in Group 6, Period 4?

The alkaline earth metals are located in Group 2.

Which of the following is correct for the nuclide notation below?

An element's identity can be determined by it's number of

The periodic table is arranged in order of increasing atomic number.

An atom is the smallest unit of a substance that still has the properties of a substance.

Alkali metals is the name given to elements in Group ___.

Which of the following represents an element with 13 protons and 15 neutrons?

Atoms of the same element with a different number of neutrons are called

What is the name of the element whose atoms contain 9 electrons and have a mass number of 19?

Bohr proposed that electrons are found in concentric circles around the nucleus based on the amount of energy they have.

He discovered the proton and that the atom is mostly empty space.

A positively charged subatomic particle found in the nucleus is called a(n)

H-1, H-2, & H-3 are isotopes of hydrogen. Which of the following is true regarding these isotopes?

The atomic number of an atom is the same as

An atom with a mass number of 25, and an atomic number of 12, would have how many neutrons?

Electrons are located

His model of the atom is known as the "billiard ball" model due to it's lack of smaller, subatomic particles.

How many protons are in an atom with 20 neutrons and a mass number of 42, and what's it's symbol?