Grade 7/ Science Exam/ Semester 2/ 2020-2021

What is the basic building block of matter (made of protons, electrons, and neutrons)?

• Matter

• Molecule

• Atom

• Crystal

Solid material whose atoms are arranged in an ordered pattern

• Matter

• Molecule

• Crystal

• Substance

What is matter?

• Atoms

• Anything that has a mass and volume

• Atoms that are combined

• Definite volume and shape

Elements are made of 

• many types of atoms 
• the periodic table
• one type of atom 
• molecules 

Is NO₂ an element or a compound?

• element

• compound

Is K an element or a molecule?

• element

• molecule

Calculate the atomic mass of Fluorine.

• 9

• 10

• 20

• 19

Is H2O an element or a compound?

• compound

• element

Which of the figures in the image is a negatively charged ion?

• A

• B

• C

• None of them

The atomic number of Boron is_________ which is equal to the number of__________. The atomic mass of Boron is________ so the number of neutrons is ___________.

• 11 / electrons / 5 / 6

• 11 / protons / 5 / 6

• 5 / protons / 11 / 6

• 5 / electrons / 11 / 15