Gr 7_Review Final Exam Semester 2

Which chemical symbols are in Period 3 and Group 4?

• Ga

• Si

• Mg

• K

Which chemical symbols are in Period 2 and Group 5?

• Sr

• Si

• N

• K

What is chemical symbol for an element that has an electronic structure with a full outer orbit?

• Ar

• N

• Ca

• Br

Which scientist suggested the idea that atoms have a nucleus?

• Dalton

• Darwin

• Galileo

• Rutherford

What are the three sub-atomic particles in an atom?

• proton, nucleon, electron

• proton, neutron, electron valensi

• proton, neutron, electrolit

• proton, neutron, electron

How many electrons are in the following atomic structure?

• 8

• 16

• 4

• 2

What is the chemical symbol of the following atomic structure?

• Al

• S

• O

• Na

All of the following are characteristics of metals, except?

• Shiny and can be polished

• High melting point

• Conductor of electricity

• Have low densities

The diagrams show the particles in different substances. The image beside represents which of the following?

• Mixture of elements

• Single element

• Mixture of elements and compounds

_____ is the process of separation of liquid from solid and other immiscible (non-mixing) liquids, by removing the liquid layer at the top from the layer of solid or liquid below.

• Filtration

• Sieving

• Distillation

• Decantation