SCIENCE ATOMS Flashcards
What is the positively charged
particle found in the nucleus
called?
Proton
What is the nuclear particle that
has no electrical charge called?
Neutron
What is the number of protons in the nucleus of an element is called?
Atomic Number
What is the total number of
protons and neutrons in the nucleus of a single atom called?
Atomic Mass/Mass Number
What do you call the atoms that
have the same number of protons but different numbers of neutrons?
Isotopes
What is the center of the atom
called?
Nucleus
With the given 13 protons and 13 electrons, how many protons and electrons are there in a 27Al13 atom?
13 Protons, 13 Electrons
What is the chemical symbol of
potassium?
K
What are the 3 subatomic parts of the atom?
Protons, Electrons, and Neutrons
Who and when were the electrons discovered?
Joseph John Thomson in 1897.
This part of an atom consists of protons and neutrons.
Nucleus
Who and when were the protons discovered?
Ernest Rutherford in 1917.
Who and when were the nucleus discovered?
Ernest Rutherford in 1911.
Who and when were the neutrons discovered?
James Chadwick in 1932.
Atomic number equals the number of _______ or _______
protons or electrons
Atomic mass equals the number of _______ + ________
protons + neutrons
It is an atom or molecule that
has a POSITIVE or NEGATIVE charge.
Ion
NEGATIVELY charged atoms
have fewer protons, more
electrons.
Anions
POSITIVELY charged atoms
have fewer electrons, more
protons.
Cations
These are atoms that have the
same number of protons, but
different numbers of neutrons.
Isotopes
The proton has a larger mass than electron. TRUE OR FALSE
TRUE
The electrons are located inside the nucleus of an atom. TRUE OR FALSE
FALSE
Among the three subatomic particles, electrons were the first one discovered. TRUE OR FALSE
TRUE
The neutron has no charge and no mass. TRUE OR FALSE
FALSE
