Chemistry & Physics Lesson 3

What is an atom?

• The largest particle of an element that still keeps the properties of that element.

• The smallest particle of an element that still keeps the properties of that element.

• A substance that contains only one kind of atom.

• The husband of Eve

An ________ is a substance that contains only one kind of atom.

What is a cation?

• A negatively charged ion

• An atom

• A positively charged ion

• An electron in the outer shell

The charge of a proton is _____.

• Negative

• No charge

• Expensive

• Positive

How many electrons can fit in the first energy level or electron shell?

• Twenty

• Two

• Eight

• Eighty

What is an anion?

• A positively charged ion

• A negatively charged ion

• An atom

• A superhero

______ electrons fit in the second energy level of an atom.

An atom is ______ when it has all the ______ electrons it needs to fill up the outer shell.

• stable

• unstable

• valence

• number

What are valence electrons?

• Electrons in the inner shell

• Electrons in the outer shell

• Electrons in the nucleus

• Electrons in the air

The nucleus of an atom contains both _______ and _______

• electrons

• neutrons

• protons

• elements