Atomic Review

What subatomic particle is found in the cloud?

Atoms with the same protons but different neutrons are called

Dimitri Mendeleev developed this to show the arrangement of the elements

What is the maximum number of electrons in the first energy level?

Who suggested that the electrons are in energy levels?

The central core of the atom

What is the mass number for an atom with 1 proton, 2 neutrons and 1 electron?

Elements that have 3 or less valence electrons are classified as

The average weight of all the mass numbers is called

What group on the periodic table is unreactive?

Who discovered the nucleus with the gold foil experiment?

How many protons for iron?

Identify the law that is shown with this example: Ethanol is always 52% Carbon, 13% Hydrogen and 35% Oxygen.

Who discovered the atom had charges in it (plum pudding)?

Identify the law that is shown with this example: Hydrogen and Oxygen can come together to make H₂O or H₂O₂

The symbol for Gold

Which of the following is correct for a Na⁺?

The smallest particle of an element that still has the properties of the element.

Mass is not created or destroyed

If an element has 8 valence electrons in the 4th energy level it is

The subatomic particle with a positive charge

What family has 1 valence electron?

The atomic number is always the

How are these similar H-1 and H-2

Elements that have the properties of both metals and nonmetals

If an element has 3 valence electrons in the 6th energy level. It is located

Groups 3-12

How many neutrons for iron?

Who believed atoms were solid spheres?

How many electrons for iron?

What is the average atomic mass 95% Fe-55 and 5% Fe-56?

The vertical columns on the periodic table

As you look from left to right on the periodic table,

The subatomic particle with no charge

Who is the most active metal?

What determines the identity of the element?

How many protons in S^2-?

What is the mass number?

An atom with a negative charge is called. . .