Chemistry Flashcards
1
Q
Cathode rays were discovered by ____.
A
Julius Plucker
2
Q
Who discovered the neutron?
A
Chadwick
3
Q
Only atom where neutrons are not present.
A
Hydrogen
4
Q
Atomic number is equal to the number of protons / neutrons?
A
Protons
5
Q
Formula for atomic mass
A
Atomic number + no. of neutrons
6
Q
Lightest isotope
A
Hydrogen
7
Q
Heaviest isotope
A
Lead
8
Q
Who coined the term ‘radioactivity’?
A
Marie Curie
9
Q
Radioactivity is measured by ____.
A
Geiger measure
10
Q
Energy of the sun is a result of ___.
A
Nuclear fusion
11
Q
___ is used to determine the age of the earth, rocks, etc.
A
Uranium dating
12
Q
Which radioisotope is used for brain imaging?
A
Iodine-123
13
Q
Which radioisotope is used for treating cancer?
A
Cobalt-60
14
Q
This ion is formed when they lose an electron.
A
Cation
- Anion is when they gain an electron
15
Q
Sharing of electrons between two elements is a ____ bond.
A
Covalent
