Chapter 3.1 Digital Lesson and 3.1 notes Flashcards
How many types of atoms are there
118
Where are neutrons located
Center of an atom
Define atom
The smallest unit of an element that maintains the properties of that element. Building blocks of matter
Define electron
A subatomic particle that has a negative charge
Define nucleus
An atoms central region which is made up of protons and neutrons
Define atomic number
The number of protons in the nucleus of an atom
Electron cloud
A region around the nucleus of an atom where electrons are likely to be found
Mass number
The sum of the number of protons and neutrons in the nucleus of an atom
Proton
A subatomic particle that had a positive charge that is located in the atom
Neutron
A subatomic particle that has no charge and that is located in the nucleus of an atom
What does atom mean in Greek
Undividable or uncuttable
What determines somethings atomic number
Number of protons
What 2 things does the atomic number tell us
How many protons the atom has, the element of the atom
What is an atoms mass number deturmined by
Number of protons and neutrons
Isotypes
Atoms with the same number of protons but different number of neutrons
Matter is made up of
Atoms
Atomic mass
Weighed average madd of all naturally occurring isotopes of the same element
Nucleus
Made up of protons and neutrons
Amu
SI unit used to express the mass of atomic particles
Where are electrons found in an atom
Electron clouds
All atoms of the same element contain the same number of
Protons
How many protons does an atom with and atomic mass of 23 and a mass number of 51 have
23
An atom has no overall electric charge because it has equal numbers of
Electrons and protons
Where are protons found
Nucleus
What is the mass of neutrons
1 amu
What determines the identity of an element
Atomic number
Isotopes exist because atoms of the same element can have different numbers of
Neutrons
How are isotopes of the same element names
Identified by their mass which is the total number of protons and neutrons
What two things have a mass of 1 amu
Protons and neutrons
Where are electrons not found
Nucleus
The number of what determines the isotope of an element
Neutrons
What must be equal in order for an atom to have a neutral charge
Protons and electrons
Ion
What we call an atom that is not neutral (positive and negative charges aren’t equal)
Mass number
Specific number
Ex: Cu-63
When you add or subtract a proton
New element
Add another atom
Molecule
Add or subtract a neutron
Isotope
Add or subtract an electron
Ion
