Review – Chemistry Answers

Flashcard maker : Kenneth McQuaid
A proton has a mass of ___ and a relative charge of ___
1; +1
A neutron has a relative mass of __ and a relative charge of ____.
1;0
An electron has a relative mass of __ and a relative charge of __.
1/1836; -1
The nucleus is at the center of the atom and contains the protons and neutrons. Protons and neutrons are collectively known as
nucleons
The atomic number of the atom is the number of
protons
the mass number of the atom is
the number of protons + the number of neutrons. Also called the nucleon number.
Isotopes
atoms which have the same atomic number but different mass numbers. They have the same number of protons but different numbers of neutrons.
Atoms are electrically neutral, and the positiveness of the protons is balanced by the negativeness of the electrons. It follows that in a neutral atom…
the number of electrons equals the number of protons
The electrons are found at considerable distances from the nucleus in a series of levels called energy levels. Which level holds how many electrons?
level 1- 2 electrons level 2- 8 electrons level 3- 8 electrons. Electrons will always go into the lowest possible energy level provided there is space.
Heisenberg Uncertainty Principle
you can’t know with certainty both where an electron is and where it’s going next. That makes it impossible to plot an orbit for an electron around a nucleus
orbital
the region of space in which an electron lives

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