Tushar 2.1 - The Nuclear Atom

Question 1

What are the subatomic particles and where are they found

Answer 1

• protons and neutrons in the nucleus

- electrons outside nucleus in shells

Question 2

Charge and masses of these subatomic particles

Answer 2

Protons: 1+ and 1 (amu)
Neutrons: 0 and 1(amu)
Electron: 1- and 1/2000 (amu)

Question 3

Symbol for atomic number and mass number and what they mean

Answer 3

Atomic number (Z): number of protons in atom
Mass number (A): number of protons and neutrons in atom

Question 4

What are isotopes

Answer 4

different atoms of the same element with different mass numbers, same number of protons but different number of neutrons

Question 5

Similarity and difference between isotopes of an element

Answer 5

• isotopes have the same chemical properties (as same # of electrons)
• they have different physical properties (as different masses = move at different speeds)

Question 6

What is a radioisotope

Answer 6

unstable isotope of an element which releases radiation (breaks down) to become more stable

Question 7

What is relative atomic mass

Answer 7

average mass of all isotopes of the element relative to one twelfth of the mass of an atom of carbon-12.

Question 8

How to calculate relative atomic mass

Answer 8

RAM = (mass1 x abundance 1) + (mass2 x abundance2) / 100