Chemistry 2nd TEST HBEL8

The atomic number of an element represents:

• The number of protons

• The number of electrons

• The sum of protons and neutrons

• The atomic mass

Electrons are found in ------------ of an atom.

• The nucleus

• Energy shells around the nucleus

• Neutrons

• Protons

Which shell of an atom is filled with electrons first?

• Second

• Third

• First

• Fourth

If an atom has 11 electrons, how many are in its outermost shell?

• 1

• 2

• 8

• 10

What is the electron configuration of carbon (atomic number 6)?

• 3, 3

• 2, 4

• 4, 2

• 6, 0

Which of these elements has the largest atomic number?

• Sodium (Na)

• Magnesium (Mg)

• Phosphorus (P)

• Sulfur (S)

Isotopes of an element differ in the number of:

• Protons

• Neutrons

• Electrons

• Shells

An atom that loses or gains electrons is called:

• Isotope

• Molecule

• Ion

• Proton

If an atom gains an electron, it becomes:

• Positively charged

• Negatively charged

• Neutral

• A molecule

How many neutrons are in the isotope carbon-14?

• 6

• 7

• 8

• 14