Periodic table and reactivity

Beryllium is in group number______.

• Group 2
• Group 3
• Group 4
• Group 7

How many Valance electrons does Iodine Have?

• 6
• 16
• 7
• 17

Tags

NGSS.HS-PS1-1

Rows on the period table are called _____ while columns are called _____.

• groups, families
• groups, periods
• periods, groups
• families, groups

An element with five valence electrons is

• phosphorus
• oxygen
• beryllium
• rubidium

Which of the following is a physical change?

• sawing a piece of wood in half
• burning a piece of wood
• rusting of an iron fence
• a copper roof changing from red to green

Which of the following is a clue of a chemical change?

• iron changes color when heated
• gas bubbles form in boiling water
• melted wax forms around hot candle
•  gas forms when vinegar and baking soda are mixed.

Tags

NGSS.MS-PS1-2

Which of the following is NOT a clue that a chemical change has occurred?

• change in color
• production of gas
• formation of a precipitate
• change in shape

Tags

NGSS.MS-PS1-2

What correctly describes the nucleus of an atom?

• protons and electrons
• neutrons and electrons
• neutrons and protons
• protons, electrons, and neutrons

Tags

NGSS.MS-PS1-1

Ne is a what?

• Compound
• Mixture
• Element
• Solution

The outer most negatively charged particles of an atom are known as what?

• electrons
• protons
• neutrons
• valance electrons