Chemistry

What is the maximum number of electrons that can fit in the valence shell of an atom?

• 2

• 8

• 18

• 32

Which of the following is a characteristic of an exothermic reaction?

• Release of heat

• Absorption of heat

• The surroundings become warmer

• Often occurs spontaneously

What particles are found in the nucleus of an atom?

• Protons and Electrons

• Neutrons and Electrons

• Protons and Neutrons

• Electrons only

Which element has the symbol S?

• Oxygen

• Sulfur

• Selenium

• Tellurium

What is the charge of a proton?

• Positive

• Negative

• Neutral

• Variable

In an endothermic reaction, the products will feel:

• Warmer

• Colder

• The same

• Unpredictable

How protons does chlorine (Cl) have?

• 5

• 6

• 17

• 8

Which of the following is true about electrons?

• They have a positive charge

• They are located in the nucleus

• They have a negligible mass compared to protons and neutrons

• They are the largest subatomic particle

What is the atomic number of Sodium (Na)?

• 11

• 35

• 18

• 34

How many protons does Argon have?

• 4

• 23

• 18

• 5