Atomic Structure - Chapter 4 Flashcards
What is a POSITIVELY charged subatomic particle?
Proton
What is a subatomic particle in the nucleus of the atom with NO change?
Neutron
What are the smallest particles of an element that retains its identity in a chemical reaction?
Atom
What is a NEGATIVELY charged subatomic particle?
Electron
What are atoms with the same number of protons but different numbers of neutrons?
Isotopes
What is the number of protons in the nucleus of an element called?
Atomic number
What is 1/12 the mass of a carbon 12 atom?
Atomic Mass Unit
What is the weighted average mass of the atom in a naturally occurring sample of an element?
Atomic Mass
What is the total number of protons and neutrons in the nucleus of the atom?
Mass number
What is true about the nucleus of an atom?
A. Negatively charged, low density
B. Positively charged, low density
C. Positively charged, high density
C. Positively charged, high density
Which one is NOT part of Dalton’s atomic theory?
A. Atoms are always in motion
B. All elements are composed of atoms
C. Atoms of the same element are alike
A. Atoms are always in motion
What do scientists KNOW about about atoms?
A. Dalton’s theories are correct
B. Atoms of an element can have different numbers of protons
C. Atoms are all divisible
C. Atoms are all divisible
How can you calculate the number of neutrons in the nucleus of an atom?
A. Add the electrons and protons
B. Subtract the protons from the mass number
C. Add the mass number to the protons
B. Subtract the protons from the mass number
What is the SUM of protons and neutrons in an atom?
A. Mass number
B. Atomic number
C. Mass
A. Mass number
Which is a FALSE statement?
A. Electrons have a mass of 1 amu
B. Electrons have a negative charge
C. The nucleus of an atom has a positive charge
A. Electrons have a mass of 1 amu
What does the number 80 in Bromine represent?
A. The Mass Number
B. The sum of protons and electrons
C. The Atomic Number
C. The Atomic Number
If an atom of an element has an atomic number of 45 and a mass number of 125 - how many protons, electron and neutrons does it have?
Protons - - 45
Electrons - - 45
Neutrons - - 80
How do the two isotopes - hydrogen 2 and hydrogen 3 differ?
A. Hydrogen 3 has 2 neutrons
B. Hydrogen 2 has 2 protons
C. Hydrogen 2 has 0 protons
A. Hydrogen 3 has 2 neutrons
Be able to fill in proton, neutron, and electron chart
Proton - charge - symbol - mass
Neutron - charge - symbol - mass
Electron - charge - symbol - mass
Proton - charge (+) - symbol (p+) - mass (1 amu)
Neutron - charge (0) - symbol (N*) - mass (1amu)
Electron - charge (-) - symbol (e-) - mass (1/1840 amu
Be able to draw Thomson’s atom
Be able to draw Rutherford’s atom
Be able to draw Rutherford’s Gold Foil Experiment
Use your notes
