Atomic Structure
What is the center of an atom called?
The Nucleus
What kind of charge do protons have?
positive
How do we know how many protons are in an atom?
atomic number
This number tells us how many protons are present in an atom.
Atomic Number
How many protons are in one atom of Hydrogen?
1
What are the three subatomic particles found in an atom?
Protons, neutrons, and electrons.
Which of the three subatomic particles is the SMALLEST?
Electrons
The number of ___________ has to equal the number of protons in a stable atom.
electrons
The basic building block of matter.
Atom
An atom is made up mostly of _______________.
a. protons
b. electrons
c. nucleus
d. empty space
d. empty space
Which two subatomic particles are in the nucleus of an atom?
Protons and Neutrons
Which subatomic particle has no charge? Also known as neutral.
neutron
How do you find the number of neutrons in an atom?
Subtract the number of protons from the atomic mass.
The center of an atom, contains protons and neutrons.
Nucleus
The part of the atom that contains the most mass is the _____________.
Nucleus
Where are electrons found in the atom?
The electron cloud or shells.
How much mass does one neutron have?
1 amu
How many electrons are present in one atom of Oxygen?
8
The neutral subatomic particle that is located in the nucleus of an atom.
Neutron
True or False: Atoms of different elements can have the same number of protons.
False - number of protons is what identifies the element.
How many electrons are able to be held in the 1st, 2nd, and 3rd shells?
first = 2
second = 8
third = 8
Which of the subatomic particles is not included when calculating mass?
Electrons
How many neutrons are present in one atom of Helium?
2
The small parts that make up an atom - not specific names, but what they are called.
Subatomic particles.
Use your periodic table to identify the number of neutrons found in Nitrogen.
7 neutrons