Atomic Structure and Isotopes Flashcards
All matter is composed of atoms
True
Atoms of any one element differ in properties from atoms of another element
True
Atoms of an element have a characteristic average mass which is unique to that element
True
Atoms cannot be subdivided, created, or destroyed in ordinary chemical reactions.
However, these changes CAN occur in nuclear reactions
True
the number of protons in the nucleus of each atom of that element
Atomic Number
the number of protons and neutrons in the nucleus of an isotope
Mass Number
number of protons + number of neutrons
Mass number
Number of protons
Atomic mass
atoms of the same element having different masses due to varying numbers of neutrons
Isotopes
how you determined the model element’s identity
By looking at the number of protons
How do you determined the model element’s charge (ions)
By subtracting the elections with the protons
Explain how you determined the model element’s isotope
By combining the element symbol with a mass number (P+N)
Explain why models must be used to build our understanding of atoms
So that we can get visual/organized understanding of atoms
Atomic number
The number of protons
Atomic mass
Protons + neutrons & multiplying by 1amu
Element symbol + (+)P unequal (-)E
(+)P - E(-)
Ion
The modern periodic table is arranged by increasing atomic number of the clements
True
Isotopes are forms of an element that have the same number of protons but a different number of neutrons
True
An input of energy is required in order for nuclear decay to happen in an atom
False
(Can happen by releasing different particles)
The stability of a nucleus is determined by the ratio of electrons to protons
False
(It’s by the neutrons and protons)
The mass of a neutron is approximately equal to the mass of a proton.
True
