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Unit 4: Atomic Structure
Terms in this set (15)
Particle made of protons, neutrons & electrons
number of protons
the total number of protons and neutrons in a nucleus.
How many valence electrons does sulfur have?
6 valence electrons
Which subatomic particles are located in the nucleus?
protons & neutrons
What is the full name of an element with 17 protons and 18 neutrons?
How many groups are on the periodic table?
How many periods?
18 groups; 7 periods
What is the charge of a proton? An electron? A neutron?
Protons are +1. Electrons are -1. Neutrons are neutral (0).
What is an isotope?
Atoms of the same element that have different numbers of neutrons
How do oxygen-16 and oxygen-18 differ?
Oxygen-18 has more neutrons than oxygen-16.
If a neutral atom has 18 protons, how many electrons does it have?
What are valence electrons?
electrons in the outermost energy level
How many valence electrons does nitrogen (N) have?
5 valence electrons
If the mass number is 20, what do you know for sure?
The total number of protons & neutrons is 20.
Aluminum (Al) is in what group and period? Is it a metal, metalloid or non-metal?
Aluminum is in group 13, period 3. It is a metal.
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