Atomic Makeup
Outer electrons
Atomic Models
Atomic Mass
The Periodic Table
100
Atoms are composed of these 3 subatomic particles
protons, neutrons, and electrons
100
Outer electrons are known as this
What are valence electrons?
100
The solid sphere model was designed as such because Dalton thought they were ___
indivisible/uncuttable
100
Atoms with a different number of neutrons are called
Isotopes
100
Who came up with the original periodic table
Mendeleev
200
Protons and neutrons are made up of even smaller particles known as ___, of which there are 6 flavors, with one being called ____
quarks; up, down, top, bottom, strange, charm
200
The elements in group 16 have how many outer electrons?
6
200
The plum pudding model was designed because ____ were discovered
electrons
200
Which subatomic particles are responsible for essentially all of an atoms mass?
Protons and neutrons
200
How was the original periodic table organized
by mass and properties
300
The subatomic particles can be found where, and with what charges?
Protons-in the nucleus with a positive charge
Neutrons-in the nucleus with a neutral charge
electrons-orbiting the nucleus with a negative charge
300
Draw a electron dot diagram for barium
300
When Rutherford shot alpha particles at the thin gold foil, he discovered ___
the nucleus
300
We ignore this subatomic particle because it is about ___ times smaller than the others
electrons, ~1800
300
The modern periodic table is organized by
atomic number and properties
400
Atoms have a net neutral charge because of this reason.
The positive charge of the protons and negative charges of the electrons cancel out.
400
Draw an electron dot diagram for astatine
400
The solar system model shows ___
how outer electrons are more easily removed than inner electrons
400
You discover a new element with the following isotopes. What's the average atomic mass?
292Vb: 32%
293Vb: 46%
295Vb: 22%
293.12 AMU
400
The horizontal rows are known as __ while the vertical columns are known as __ or ___
periods; families or groups
500
The most common isotope of arsenic has ___ protons, ___ neutrons, and ___ electrons.
33 protons, 42 neutrons, and 33 electrons
500
Electron dot diagrams are important for chemists because of this reason
They show how the element will react with other elements
500
Put the following models in order from oldest to newest.
electron cloud, plum pudding, nuclear, solar system, solid sphere
solid sphere, plum pudding, nuclear, solar system, electron cloud
500
You have the following sample of magnesium, what's its average atomic mass?
24Mg: 59
25Mg: 10
26Mg: 11
24.4 AMU
500
If elements are in the same group, they have the same properties because...
they have the same number of valence electrons