Science Grade7

The Number of Elements still now is

• 112

• 143

• 116

• 118

The 3 Types of Elements are...................

All these properties are from the properties of metals except

• In The Chemical Reaction It loses Electrons

• Don't have Metallic luster

• It's outer most energy level is less than 4 electrons

Write 2 From the Noble gases

When The Mg (Magnesium) loses 2 Electrons It Wrote Like

• Mg-2

• Mg+

• Mg+2

• Mg-

When The N (Nitrogen) Gains 3 Electrons. .It Wrote Like

• N-3

• N+3

• N+2

• N-

There are 2 Types of Chemical Bond .........

The NaCl (Table Salt ) is an ionic bond formed due

• Electric Attraction

• Chemical Reaction

• Physical Change

The O2 Molecule Is Formed Due To ........... Covalent Bond

• Ionic Bond

• Triple Covalent Bond

• Double Covalent Bond

• Single Covalent Bond

The HCl Compound Is formed Due to............