review for ps-2 – properties of atoms. atoms are made up of – protons – neutrons – electrons

Review for PS-2 – Properties of Atoms

Atoms are made up of – Protons– Neutrons – Electrons

What type of charges do all particles have– protons= positive– Electrons= negative– Neutrons= neutral

Where is everything in an atom located?– Protons – nucleus– Neutrons- nucleus– Electrons- electron cloud or energy level

How much does each particle weigh?– Protons- 1 amu– Neutrons-1 amu– Electrons- 0 amu

Periods are ____________________ horizontal Groups are ____________________ vertical

The maximum number of electrons that the first energy level? Second energy? can hold is

2 8

What are the symbols for Chlorine and Magnesium?

Cl Mg

Can the EXACT location of the electron be located?

NO

The identity of an atom is determined by its Number of protons The group number of an atom indicates its Number of valence electrons AND its

chemical properties

How do you find the number of neutrons? MASS NUMBER- ATOMIC NUMBER How do you find the number of protons of an

atom? ATOMIC NUMBER How do you find the mass number? Add the number of neutrons that the problem

gives you to the number of protons

The smallest unit of matter is The atom

What are the names of groups 1,2,17 and 18 Alkali metals, alkaline earth metals, halogens

and noble gases

If an atom loses electrons, it is a _________ ion?

positive

Lewis dot diagrams are used to represent _________.

Valence electrons

At room temperature most non-metals are _________________

gas

Neutrons released in a fission reaction could cause a ________ ____________.

Chain reaction

For Magnesium, what is the… Atomic number- 12 Average atomic mass-24.31 Number of neutrons-12 Number of valence electrons-2 Oxidation number +2 Group number 2 Period number 3

What is an isotope? Same atom (element) with a different number

of neutrons and a different mass number

Draw a Lewis structure and a Bohr’s model for oxygen

A ___________ reaction is a nuclear reaction that involves the joining of two or more nuclei of atoms

Fusion A ___________ reaction is the splitting of

nuclei. fission

Like charges ____________. Repel Unlike charges __________. attract

Write the isotope notation for the three isotopes of H.

H-1 OR H-2 OR H-3 OR

What are some benefits of radioactive isotopes?

Diagnosing medical problems, dating fossils What are some benefits of nuclear

reactions? Power reactors, treatment of cancer