Particles
What is a proton?
The positively-charged particle of an atom
The atomic number represents the number of what?
Protons
What is the abbreviation of an element called?
Chemical Symbol
How many groups are on the Periodic Table?
18
Why is atomic mass often a decimal?
It represents the average relative atomic mass of all isotopes of the element
What is a neutron?
The neutrally-charged particle of an atom
What is the atomic number of potassium?
19
What is the group and period of Silicon?
Group 14, Period 3
How do you figure out how many Neutrons are in an atom?
Atomic Mass - Atomic Number = Neutrons
What is the average relative atomic mass?
The weighted average of the masses of the isotopes of an element
What is an electron?
The negatively-charged particle of an atom
What is the atomic number of Magnesium?
What element is in Group 2, Period 3
Magnesium
Iron's atomic number is 26 and its mass is 56. How many Neutrons are in Iron?
30
What charge does a neutron have?
Neutral.
What particle determines the identity or Atomic Number of an atom?
Protons
What two particles each have a mass of approximately 1 amu?
Protons and Neutrons
What element's atom has 6 protons?
Carbon
True or False: Neutrons = Protons in an atom.
False, Electrons equal Protons in an atom.
How many electrons does a neutral atom with 6 protons have?
What is the charge of a neutron?
Neutral (0)
What is the mass number of Chlorine?
35
What is the atomic number of lithium?
3
What are isotopes?
Atoms of the same element with different numbers of neutrons
How many total protons and electrons are in a neutral atom?
The same number; equals the atomic number