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.
What do atoms of the same element all have?
The same number of protons.
How do you identify if an element is different to another element?
By looking at their atomic number to see how many protons they have.
How do you get the number of neutrons?
Subtract the atomic number from the mass number.
Why aren’t electrons counted in the mass number?
Because their relative mass is negligible (very small).
How are compounds formed?
When atoms of two or more elements are chemically combined together.
What is it difficult to do to compounds?
Separate the two elements out again.
What are isotopes?
Different atomic forms of the same element, which have the same number of protons but a different number of neutrons.
What must isotopes have?
The same atomic number but different mass numbers.
What are a popular pair of isotopes?
-Carbon-12
(6 protons, 6 neutrons, 6 electrons).
-Carbon-14
(6 protons, 8 neutrons, 6 electrons).
