Periodic Table Flashcards
Give the charge of an electron.
-1
Give the charge of a proton.
+1
Give the charge of a neutron.
0
What are isotopes?
Atoms of an element with the same number of protons but a different number of neutrons. They have different mass numbers.
Give the mass of a neutron.
1
Where are protons, neutrons and electrons located in an atom?
Neutrons and protons in the nucleus.
Electrons in shells.
Compare the size of an atom and its nucleus.
A ball in a football stadium.
Give the mass of an electron.
1/2000
Where in the atom would you find most of the mass?
The nucleus.
75% of a Cl has a mass of 35 and the rest has a mass of 37. Calculate the mean mass of a chlorine atom.
75x35 then 25x37
Add them together and divide by 100.
Why is the mass of chlorine not a whole number?
Average of the isotopes.
What does the mass number of an atom tell you?
The number of things in the nucleus (protons and neutrons.)
Give the mass of a proton.
1
Why do atoms contain equal numbers of protons and electrons?
Atoms are neutral.
What does the atomic number tell you?
Protons/electrons.
Describe how the Dalton Model of an atom has changed over time.
Found out about protons and electrons.
Why is oxygen in group 6 of the periodic table?
It has 6 electrons in its outer shell.
How do you work out the number of neutrons?
Mass number-atomic number.
How are elements arranged in the periodic table?
In order of increasing atomic number.
