Final part 2

Rotting bananas?

• Physical Change
• Chemical Change

An atom of an element has 36 protons, 36 electrons, and a mass number of 84? How many neutrons?

• 36

• 72

• 48

• 8

Atoms of a certain element have 11 protons and 1 valence electron. Which statement is correct?

• the element is sodium and it is not reactive

• the element is fluorine and it is highly reactive

• the element is fluorine and it is not reactive

• the element is sodium and it is highly reactive

Which two elements are in the same period?

• F and Cl

• Sn and Rb

• K and Ba

• Se and Te

The living organisms in an ecosystem such as plants and animals

• adaptation
• biotic
• decomposer
• abiotic

1 1 How many valence electrons are in an atom of each element in Group 15 in the periodic table?

• 05

• 06

• 15

• 16

Which of the following is not a physical property of matter?

• solubility

• density

• conductivity

• flammability

• It has no mass and a positive charge.
• It has mass and a positive charge.
• It has no mass and no charge.
• It has a large mass and a negative charge.

Look at the following chemical formula:
(NH₄)₂CO_{3
How many atoms of Hydrogen are found in this molecule?}

• 4
• 2
• 8
• 6

An atom of an element contains 20 protons.  What is the identity of the element?

• argon
• calcium
• neon
• potassium