Quiz on Elements (D)

What is an element?

• A type of molecule

• A compound of two or more elements

• A pure substance made from a single type of atom

• A mixture of different types of atoms

What is the atomic number of hydrogen?

• 14

• 79

• 2

• 1

Which element is important in electronics and has an atomic number of 14?

• Helium

• Silicon

• Gold

• Carbon

How many known elements are there currently?

• 118

• 79

• 94

• 14

Which of the following is a noble gas?

• Helium

• Sodium

• Carbon

• Iron

What is unique about noble gases?

• Their outer shell of atoms is full of electrons

• They have 1 electron in the outer shell

• They are metals

• They are very reactive

Which element is the most common in the universe?

• Hydrogen

• Oxygen

• Carbon

• Helium

What are isotopes?

• Elements that are gases at room temperature

• Atoms with the same number of electrons

• Different elements with the same number of protons

• Atoms of the same element with different numbers of neutrons

Which of the following is an alkali metal?

• Carbon

• Helium

• Lithium

• Neon

What is the periodic table used for?

• Learning and understanding elements for chemistry

• Mixing different elements

• Creating new elements

• Measuring the weight of elements