Year 8: Atomic Structure: protons, neutrons, electrons and electronic structure
How do you calculate the number of neutrons for a lithium?(⁷₃Li)
The top number - the bottom number=7-3=4 or The mass number - the proton number=7-3=4
What do the two numbers associated with lithium mean? ⁷₃Li
The top number is equal to the protons + neutrons=mass number=7 The bottom number is the number of protons=3
Which is the atomic mass number of an atom equal to? (¹²₆C)
12 (It is equal to the number of protons+ the number of neutrons).
What particle has the opposite charge to that of a proton?
An electron
If you look at a periodic table there are two numbers associated with each element. What is the smallest number called?
Atomic number
What sub-atomic particle which has very little mass can atoms gain or lose?
Electrons
What is the charge and mass of a proton?
It has a mass of 1 and a charge of +1
What does the number 9 on the following mean ₉F?
It means there are 9 protons present.
An atom of the fluorine has no charge (it is neutral) how many electrons will it have? ₉F
It will have 9 negative electrons present to balance the 9 positive protons.
What number do you get if you sum the number of protons and neutrons for an atom?
Mass number
What are the two parts an atom can be divided into?
Nucleus and electron shells
What particles which make up an atom are charged?
Protons and electrons
What sub-atomic particle which has a positive charge is fixed for each specific atom of an element?
Protons.
What needs to be present for an atom to be neutral?
Same number of positive protons and negative electrons.
How do you calculate the number of electrons in a neutral atom?
The number of protons = the number of electrons for a neutral atom
What term is used for the sum of protons and neutrons for an atom?
Mass number
What particles give an atom most of their mass?
Protons and neutrons
What are the two particles which contribute most to the mass of an atom?
Protons and neutrons.
What is the mass of a protons and a neutron?
1
What is the total number of protons and neutrons for the following? (¹²₆C)
12 (The number at the top is equal to the number of protons + the number of neutrons).
Which of the two numbers is the atomic mass number of carbon (¹²₆C)?
12 (The number at the top left is the atomic mass number).
How many neutrons does the following carbon atom have? (¹²₆C)
12 is the mass number (equal to the number of protons+ the number of neutrons), 6=the number of protons. The difference is the number of neutrons-->12-6=6
How many electrons will a potassium atom have given it has 19 protons and 20 neutrons?
19(The number of protons = the number of electrons for a neutral atom)
How many protons does a helium atom have? (⁴₂He)
2 (The number at the bottom left is the number of protons which is called the atomic number).
Which of the two numbers is helium's atomic number? (⁴₂He)
2 (The number at the bottom left is where the atomic number is written).
How many electrons will a helium atom have given it has 2 protons?
2 (The number of protons = the number of electrons for a neutral atom).
How many protons does lithium (⁷₃Li) have?
3 (The number at the bottom left is equal to the number of protons in an atom, also called the atomic number).
How many electrons will a lithium atom have given it has 3 protons and 4 neutrons?
3(The number of protons = the number of electrons for a neutral atom).
How many protons does carbon (¹²₆C) have?
6 (The number at the bottom left is equal to the number of protons in an atom, also called the atomic number).
Which of the two numbers is the atomic mass number of lithium (⁷₃Li)?
7 (The number at the top left is the atomic mass number).
What does the number 4 on following helium atom mean? ⁴He
Helium has a mass number of 4, which is equal to the number of particles in the nucleus (protons and neutrons).
What is the charge and mass of a neutron?
It has a mass of 1 and a charge of 0
What is the charge and mass of an electron?
It has a negligible mass (or 1 /2000) and a charge of -1
What are the two particles found in the nucleus?
protons and neutrons.
How many protons, neutrons and electrons does the following atom have (⁴₂He)?
p⁺=2, e⁻=2,n=2
How many protons, neutrons and electrons does the following atom have (⁷₃Li)?
p⁺=3, e⁻=3, n=4
How many protons, neutrons and electrons does the following atom have (¹⁴₆C)?
p⁺=6, e⁻=6,n=8
