Atomic Structure
What are the three parts of an atom?
proton, neutron, electron
The atomic number in an atom is the same as...
a) mass and neutrons
b) electrons and neutrons
c) protons and electrons
c) protons and electrons
The number of protons in an atom of a certain element.
atomic number
The basic building blocks of matter (the smallest part of an element)
Atom
The number of electrons an orbital can hold on the first shell
2
Which part of an atom has a negative charge?
Electrons have a negative charge.
Neon has an atomic number of 10 and mass of 20. How many neutrons does it have?
10
The sum of protons and neutrons in the nucleus of an atom.
mass number
The unit of measure the atomic mass is measured in.
AMU or atomic mass unit
If Oxygen has 8 protons, how many electrons does it have?
8
Which part(s) of an atom make up most of the ATOMIC MASS?
The protons and neutrons make up most of the atomic mass.
The center of an atom is called the
nucleus
What does APE stand for?
Atomic number = protons = electrons
The atomic mass is based on the number of these two parts of the atom.
the protons and the neutrons
If the atomic mass of an element is 15 and it has 4 protons, how many neutrons does it have?
11
15-4 = 11
The two sub-atomic particles that make up the nucleus.
What are protons & neutrons?
Which scientist proposed that all atoms are indivisible and indestructible?
Dalton
What does MAN stand for?
Mass - Atomic Number = Neutrons
What is the same as the number of electrons in an atom?
a) Protons and neutrons
b) Atomic number and protons
c) Nucleus
b) Atomic number and protons
•True or False:
Protons and electrons are stored in the nucleus.
False: protons and neutrons
Where are the neutrons located?
True or False?
In the currently accepted model of the atom, electrons are located inside the nucleus.
False
Calculate the number of protons, neutrons, and electrons of the Element Silicon.
Atomic Number: 14
Mass: 28
Protons = 14
Mass = 14
Electrons = 14
The “orbits” the electrons have around the nucleus are called this.
energy levels or shells
What do we call the electrons that are located in the outermost energy level?
valence electrons