year 8 revision 3 Flashcards
1
Q
What is the first element on the periodic table?
A
Hydrogen
2
Q
What is the centre of an atom called?
A
A nucleus
3
Q
What is the main gas found in the air we breathe?
A
Nitrogen (around 78%)
4
Q
True or false? An electron carries a positive charge.
A
False
5
Q
True or false? Acids have a pH level below 7.
A
True
6
Q
What is the fourth most abundant element in the universe in terms of mass?
A
Carbon
7
Q
True or false? A proton carries a positive charge.
A
True
8
Q
Atoms of the same chemical element that have different atomic mass are known as?
A
Isotopes
9
Q
What is the third most common gas found in the air we breathe?
A
Argon (around 1%)
10
Q
What is H20 more commonly known as?
A
Water
