chem 1 review

According to the Bohr model, how many electrons can the first orbital hold?

• 2

• 4

• 6

• 8

In what condition will an ionic bond form?

• The metal atom accepts the electron that is lost by the non-metal

• A non-metal combines with another non-metal.

• There is a sharing of electrons between the atoms.

• Particles with charges are present

How many valence electrons does a carbon atom have?

• 1

• 2

• 3

• 4

Which is the correct chemical formula for sodium chloride?

• NaCl

• Na2Cl

• Na3Cl2

• Na2Cl5

What is the group number and period number of an element with an electron configuration: 1s2, 2s2, 2p6?

• Group IIA period 3

• Group IVA period 2

• Group VIIIA period 2

• Group VIIIA period 4

What is the molecular formula of methane?

• CH4

• CH3CH3

• H2C = CH2

• CH3CH2CH3

Type of bond wherein the positive nuclei of the atoms (of iron, for example) are surrounded by electrons moving freely throughout a piece of the metal

• covalent

• electrovalent

• ionic

• metallic

Copper is used in electrical cords because it is a good conductor of electricity. Which statement can explain this?

• The copper nuclei are close together and can easily transfer heat.

• Electrons, which are negatively charged particles, are free to move within the metal.

• Copper atoms can slide over one another without breaking the bonds between them

• The free valence electrons in copper can help bounce radiation back to give a shiny appearance.

Describe a substance that is a good conductor of electricity.

I. Melts easily

II. Dissolves in water

III. Forms ions in a mixture with water

IV. Allows current to pass through it.

• I and II

• III and IV

• I, II, and III

• II, III and IV

What is the name of the model of the atom that scientists use today?

• Billiard Model

• The Nuclear Model

• Plum Pudding Model

• Quantum Mechanical Model