Chemistry Revision Yr 10

How do you determine an atomic number?

• the number of protons

• the number of neutrons

• the mass

• the number of protons and neutrons together

What is the element for atomic number 83?

• Tantalum

• Scandium

• Bismuth

• Iodine

What charge does an electron have?

• Positive

• Negative

• Neutral

How many electrons can there be in the second shell?

• 7

• 10

• 2

• 8

What is a molecule?

• They are made of only one kind of atom

• 2 atoms that join together

• A substance formed by chemical union of 2 or more elements

• When 2 or more substances are combined, but they are not chemically combined

Which group has the most elements?

• Metal

• Metalloid

• Nonmetal

What is a covalent bond?

• Electrons are shared

• Electrons shared between many atoms (metal atoms)

• Electrons are donated

• Electrons are shared between nonmetal elements

What is the atomic number of manganese?

• 54.94

• 67.85

• 29.69

• 51.41

What does the Law of Conservation of Mass state?

• That mass is neither created nor destroyed in any chemical reaection.

• That mack is neither created nor destroyed in any chemical reaction.

• That mass is neither created nor destroyed in any chemical reaction.

• That mass niether nor destroyed in any chemical reaction.

How many protons are there in the element, cadmium?

• 67

• 52

• 49

• 48