Physical Science Unit 1 Test

Elements in the same ​ (a)   have the same number of electrons in their outermost energy levels. These electrons are called ​ (b)   electrons. It is these outermost electrons that determine the chemical reactivity of each individual element. It is important to understand the relationship between the location of an element in the periodic table, the element’s chemical behavior, and the element’s atomic structure.

• valence
• group
• period
• negative

Energy levels coincide with the number of (a)   on the periodic table. These energy levels are named using numbers (b)   to seven. The maximum number of electrons that can be placed in the first energy level is ​ (c)   . Energy level two can hold a maximum of ​ (d)   electrons.

• periods
• one
• two
• eight
• five
• groups

What is the name of this element?

• Lithium
• Boron
• Carbon
• Neon

Tags

NGSS.MS-PS1-1

What group does this element belong to?

• Group 1: Alkali metals
• Group 18: Noble Gases
• Group 2: Alkaline-Earth Metals
• Group 17: Halogens

How many valence electrons?

• 2
• 3
• 5
• 10

Tags

NGSS.MS-PS1-1

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

What is the atomic number of this element?

• 17

• 18

• 35

• 35.453

Tags

NGSS.MS-PS1-1

When an atom loses a valence electron, it becomes a(n) _____________ ion.

• positive
• negative
• neutral
• polyatomic

How many neutrons does C-14 contain? (tap to enlarge the image)

• 6

• 7

• 14

• 8

Tags

NGSS.MS-PS1-1

If an atom has 9 protons and 10 electrons it has a charge of ____.

• 0

• -1

• +1

• -2