Welcome to your Grade 8 General science chapter 2
After carefully reading the following 30 questions, choose the correct answer.
1.
Which Greek philosopher proposed the idea that matter is continuous?
2.
Who was the Greek philosopher that first proposed the idea of "atoms"?
3.
What does the term "atomos" mean in Greek?
4.
According to Dalton's atomic theory, what are elements made of?
5.
What are the two main parts of an atom?
6.
Which sub-atomic particles are located inside the nucleus?
7.
What is the electric charge of a proton?
8.
Which sub-atomic particle has a negative charge?
9.
What is the charge of a neutron?
10.
Which part of the atom accounts for most of its mass?
11.
What does the atomic number of an element represent?
12.
How is the mass number of an atom calculated?
13.
In a neutral atom, the number of protons is equal to the number of which other particle?
14.
What is the mass number of an atom with 12 protons and 12 neutrons?
15.
Which particle is found revolving around the nucleus?
17.
What are molecules containing only one type of atom called?
18.
Which of the following is an example of a diatomic molecule?
19.
How are monoatomic molecules defined?
20.
Which of these is a polyatomic molecule?
21.
What type of molecule contains two or more atoms of different elements?
22.
Which of the following is a molecule of a compound?
23.
Which two particles have approximately the same mass?
24.
In the symbol O₈¹⁶, what does the number 8 represent?
25.
If an atom has 8 protons and a mass number of 16, how many neutrons does it have?
26.
What is the overall charge of the nucleus of an atom?
27.
Which scientist's theory stated that atoms of the same element are identical in mass and properties?
28.
Which group of elements exists as monoatomic molecules?
29.
What is the simplest part of an element that has the properties of that element?
30.
According to the text, which particles are located in the nucleus?
