Chemical Behavior of Elements

How many valence electrons are in an atom of each element in Group 15 in the periodic table?

(answer should be a number only: example- 8)

The periodic table is organized into groups and periods of elements. The characteristics of a certain group of elements are listed below.

Which of these elements is in this group?

• Lithium

• Strontium

• Aluminum

• Silicon

Most metals are ______ at room temperature.

• solid

• liquid

• gas

Four students were asked to complete a table for a science assignment. Each student selected one chemical element from each of four groups in the periodic table and then classified each element as a metal, nonmetal or metalloid. Which table was completed correctly?

• A

• B

• C

• D

How many electrons are in this element?

• 39

• 19

• 20

• 21

What is the atomic mass of Copper

• atomic mass is 20

• atomic mass is 63

• atomic mass is 64

• atomic mass is 15

How should potassium, calcium, arsenic and bromine be arranged in order of increasing number of protons in the nucleus?

• K, As. Ca, Br

• K, Ca, Br, As

• K, Ca, As, Br

This is the atomic structure of calcium.

Which element will have the same valence electron as calcium

• Oxygen (O)

• Lithium(Li)

• Magnesium(Mg)

• Aluminium (Al)

 What is the mass number of this element?

• 5
• 27
• 32
• 59

Elements in each column or group have similar physical and chemial properties

• True

• False