Atomic Structure Flashcards
Who invented the plum pudding model?
Ernest Rutherford
Who discovered the neutron?
James Chadwick
What is the mass of an electron?
1/1840
What is the mass of both a proton and a neutron?
1
What is the charge of a proton?
-1
What is the charge of a neutron?
0
What is the charge of an electron?
-1
Where are electrons found?
In shells orbiting the nucleus
Where are protons and neutrons found?
The nucleus
What is the atomic number?
The number of protons in the nucleus of an atom
What is the mass number?
The total number of protons and neutrons in the nucleus of an atom
Why does an atom have no electrical charge?
The total +1 charges of the protons cancel out the total -1 charges of the electrons
How many electrons are found in the first shell of an atom?
2
How many electrons are found in the second shell of an atom?
8
What are isotopes?
Atoms (of the same element) that hove the same atomic number but different mass number/ same number of protons different number of neutrons
The masses of all atoms are measured relative to which atom?
Carbon 12
What is an element?
A substance that consist of only one type of atom and it cannot be broken down into anything simpler by chemical means
If an ion has a charge of 2+, what needs to happen to it to become stable?
Lose 2 electrons
What is the relative atomic mass?
The mass of an atom compared with that of the carbon 12 isotope.
