Unit 1 Quiz

What is the main topic of Lesson 4 in Unit 1?

• Structure of the atom

• Matter and its properties

• Chemical bonds

• The periodic table of elements

What does the chemical symbol of an element represent?

• A single atom of the element.

• The number of protons in the element.

• The atomic mass of the element.

• The number of electrons in the element.

The .................... model is considered the first experimental model of the atom.

• Bohr

• Mendeleev

• Moseley

• Rutherford

How many protons does Calcium (Ca) have?

• 20

• 40

• 12

• 11

Element M has electrons that orbit in four energy levels, and its nucleus contains 20 neutral particles. If the number of electrons in the outermost energy level is half the number of electrons in its first energy level, then its mass number is:................

• 20

• 40

• 60

• 80

The chemical symbol for the element copper is __________, while the chemical symbol for the element iron is __________.

• Cu, Fe

• Co, Fe

• Cu, Ir

• C, Fe

Which element is necessary for the greening of plant leaves, while which element is necessary for strengthening its roots?

• Nitrogen, Phosphorus

• Phosphorus, Nitrogen

• Carbon, Oxygen

• Oxygen, Carbon

The atomic number is represented by the symbol __________ and is written __________ the element's symbol.

• Z, above

• A, below

• Z, below

• A, above

The element whose nucleus contains 3 protons and 4 neutrons has an atomic number of __________ and a mass number of __________.

• 3, 7

• 4, 7

• 3, 6

• 4, 6

Isotopes of the same element have the same number of protons but differ in what?

• Number of electrons

• Number of neutrons

• Atomic number

• Energy levels