Atoms, Compounds And Isotopes Flashcards
What is the mass number?
The total number of protons and neutrons.
What is the atomic number?
The number of protons.
How would you work out the number of neutrons?
Subtract the atomic number from the mass number.
Why are electrons not counted in the mass number?
Because there relative mass is very small.
What are compounds?
Compounds are formed when atoms of two or more elements are chemically combined together. For example, carbon dioxide is a compound formed from carbon and oxygen.
What is difficult to do with compounds?
It is difficult to separate the two original elements out again.
Explain what is meant by the term isotope.
Isotopes are different atomic forms of the same element, which have the same number of protons but a different number of neutrons. Eg carbon 12 and carbon 14
What do atoms contain?
Protons, neutrons and electrons.
