Flashcards in Atomic Structure Deck (11):
Write the three sub-atomic particles, their relative mass and their relative charge.
Describe the nucleus
The nucleus is in the middle of an atom and contains protons and neutrons, creating a positive charge. Despite the nucleus being tiny, it still has the majority of the weight of the atom
Electrons move around the nucleus in energy levels called shells and are negatively charged. The electrons are tiny but their orbit takes up lots of space and determines the size of the atom. Electrons have a very low mass and it is sometimes given as 0.
Describe what each number assigned to an element on the periodic table means.
24 [larger number] - mass number (protons + neutrons)
Mg- element symbol
12 [smaller number]- number of protons in the nucleus
Describe what an isotope is.
Isotopes are different forms of the same element, which have the same number of protons, but different numbers of neutrons.
Why are the weights of elements on the periodic table normally decimals
Most elements are made up of lots of different isotopes and the mean average is taken.
What does RAM stand for
Relative Atomic Mass
How can you work out the RAM of a substance, use copper as an example, which is:
37 Cl - 25%
35 Cl - 75%
(37 x 25 + 35 x 75) / 100
How are electrons arranged
In shells around the nucleus, from the inside out.
Shell - Max
1 - 2
2 - 8
3 - 8
How can you tell what group the element is in
How many electrons are in the furthest ring out (of answer is full, it is group 0)