Atoms and Elements Flashcards
Describe the structure of an atom.
Nucleus made from protons and neutrons in the middle. Electrons surround the nucleus
What is the charge of a proton?
Positive (+)
What is the charge of an electron?
Negative (-)
What is the charge of a neutron?
Neutral (no charge)
Electons move in ______ around the nucleus.
shells
Do atoms have an overall charge? Why?
No - they are neutral overall. Because they have the same number of protons and electrons.
Does the number of protons in an atom always equal the number of electrons?
Yes
What happens if a proton or electron is added or removed from an atom?
The atom becomes charged. It is now called an ion.
What is an ion?
An atom that had gained or lost an electron so its overall charge is no longer neutral.
What is an element?
A type of atom.
What decides element that an atom will be?
The number of protons in the atom e.g. the element hydrogen contains only 1 proton in its nucleus.
Which element contains 2 protons in its nucleus?
Helium
Approximately how many elements are there?
100
Does the number of protons in an atom always equal the number of electrons?
Yes
does the number of protons in an ion always equal the number of electrons?
No
Identify the missing label
Electron shell
Identify the missing label
Electron
Identify the missing label
Nucleus
Identify the missing label
Proton
