Atoms Flashcards
The part of an atom that carries a positive charge
Protons
The number of electrons that can be held in the first orbit (closest to the nucleus)
Two
The number of electrons that can be held in the third orbit
Eighteen
The part of an atom that carries a negative charge
Electron
The number of electrons that can be held in the second orbit
Eight
There are the same number of these two particles in a atom
Protons and electrons
The atomic number is the same as the number of these particles
Protons
The mass of subatomic particles is measured in _____
AMU’s
The _______ _______
Tells the number of protons in the nucleus of an atom
Atomic number
The mass number of an element is the sum of its _______ and _______
Protons and neutrons
Atoms of the same element that have a different number of neutrons are called ______
Isotopes
The _____ ______ is the space around the nucleus where electrons can be found
Electronic cloud
A ______ is a subatomic particle that makes up protons and neutrons
Nucleus
Different isotopes of an element will have different ______ _______ _______
Numbers of neutrons
Electrons in an electron cloud are arranged into _______ _______
Energy levels
The ______ _______ of an element is the average of all of the mass numbers of the isotopes of that element
Atomic mass
Protons, neutrons, and electrons are examples of ______ _________
Subatomic particles
Protons have a mass of ___ Amu
1 amu
Electrons have a mass of _______ amu
1/1836 amu
A neutron has a mass of _______ amu
1 amu
A neutron has a _______ charge
Neutral
Particle that makes up all other known particles in the nucleus of an atom
Quark
Force of attraction or repulsion between particles in an atom
Electromagnetic force
Force that binds protons and neutrons in the nucleus
Strong force
Force that is key to the power of the sun and responsible for the process known as radioactive decay
Weak force
Force of attraction between all objects in the universe
Gravity
The number of protons in the nucleus of an atom is the ______ ________
Atomic number
Democritus concluded that you couldn’t keep dividing matter forever, eventually the smallest would be obtained and he called it the ______
Atom
The small, heavy center of the atom is the _____
Nucleus
The scientist J.J Thompson discovered the ______
Electron
Particles smaller than the atom are called ______
Subatomic particles
The nucleus of an atom contains A. Protons and electrons B. Neutrons and electrons C.protons, neutrons, and electrons D. Protons and neutrons
D. Protons and neutrons
The number of protons in an atom with an atomic number of 18 is
A. 10
B. 36
C. 18
D.8
C.18
Which of the following forces within the atom is responsible for keeping electrons in orbit around the nucleus
A.electromagnetic
B. Weak
C. Gravity
D. Strong
A. Electromagnetic
All nuclear particles are thought to be made of a combination of three
A. Electrons
B. Quarks
C. Isotopes
D. Molecules
B. Quarks
The arrangement and location of what subatomic particles determine the chemical properties of an atom A. Protons B. Quarks C. Neutrons D. Electrons
D. Electrons
Most of the mass of the atom is located in the ______
Nucleus
Electrons that have the least amount of energy levels are located _______ from the nucleus
Closest
In thompsons experiment , the gas in the tune gave off rays that were negatively charged particles called _______
Neutrons
John dalton a theory was that matter is made of indivisible _____, or atoms
Particles
The part of an atom that carries no electric charge
Neutrons
