1
Which isotope is commonly used in the treatment of cancer?
2
The atomic number of an element is 17 and its mass number is 35. How many neutrons does it have?
3
The mass number of an atom is the sum of:
4
Which subatomic particle was discovered by J.J. Thomson using cathode ray tubes?
5
Which of the following correctly represents the electronic configuration of sodium (atomic number 11)?
6
In Bohr's atomic model, electrons revolve around the nucleus in:
7
Which subatomic particle has no charge?
8
An isotope used in the treatment of cancer is:
9
The maximum number of electrons that can be accommodated in the M shell (n=3) of an atom is:
10
Which subatomic particle carries a negative charge?
11
The maximum number of electrons that can be accommodated in the L shell (n=2) is:
12
Which of the following elements is placed in Group 1 of the modern periodic table?
13
Rutherford's gold foil experiment led to the discovery of the:
14
Which postulate is part of Bohr's atomic model?
15
What is the atomic number of an element if it has 12 protons and 12 neutrons?
16
An atom of carbon-14 contains:
17
What is the maximum number of electrons that can be accommodated in the first shell (K shell) of an atom?
18
Which of the following elements is placed in Group 18 of the modern periodic table?
19
Which isotope is used in the treatment of cancer?
20
The number of neutrons in an atom of Carbon-14 (atomic number 6) is:
21
Rutherford's alpha-particle scattering experiment led to the discovery of:
22
Which of the following statements about isotopes is correct?
23
The atomic number of an element is equal to the number of:
24
Which isotope is commonly used to determine the age of archaeological artifacts?
25
Which subatomic particle was discovered by J.J. Thomson?