Show:
Atomic Theory
Reading the Periodic Table
Electromagnetic Spectrum
Average Atomic Mass
Trends
100

Mendeleev arranged the periodic table by -- 

atomic mass 

100

In a neutral atom, protons are equal to ...

electrons

100

Which type of waves have the longest wavelength?

radio waves

100

What two particles make up the atomic mass?

protons & neutrons

100
Which periodic trend represents the amount of energy needed to remove an electron?

ionization energy

200

Henry G.J. Mosely arranged the periodic table by their number of --

protons

200
How many valence electrons does group 14 have?

4

200

If a wave has high energy, does it have short or long wavelengths?

short

200

Isotopes have the same number of protons, but different numbers of _________. 

neutrons

200

As you move from left to right on the periodic table, electronegativity -- (increases or decreases)

increases

300

Cathode ray tubes were used to discover what subatomic particle? 

electrons

300

Elements in the same _______ have similar chemical properties or reactivity. 

Group

300

As frequency increases across the spectrum, wavelength ________ and energy _________. (increases or decreases; must have 2 answers)

decreases; increases
300

How many protons, neutrons, and electrons does Copper-65 have?

29 protons

36 neutrons

29 electrons

300
As you go from top to bottom down a group, atomic radius -- (increases or decreases)

increases

400

Who experimented with gold foil and discovered the nucleus?

Ernest Rutherford 

400

Which group is stable and does not react with other substances? 

Group 18

400

Which color of light have the highest amount of energy? 

violet

400

Calculate the average atomic mass of sulfur if 95.00% of all sulfur atoms have a mass of 31.972 amu, 0.76% has a mass of 32.971 amu, and 4.22% have a mass of 33.967 amu. 

(0.9500 x 31.972) + (0.0076 x 32.971) + (0.00422 x 33.976) = 32.1 amu

400

Elements on the left side of the periodic table have lower ionization energy than those on the right. Why? 

Valence electrons are farther away from the nucleus on the left side. 

500

Who studied light and electron movement to discover that electrons are in fixed orbits?

Niels Bohr

500

What determines the identity of an element? 

number of protons/atomic number

500

During which phase does an atom give off light? Excitation or Emission

Emission

500

Why is the average atomic mass of chlorine closer to the mass of chlorine-35 than chlorine-37?

Chlorine-35 has a larger percent abundance. 

500

Compared to metals, nonmetals tend to have ________ electronegativity (higher or lower).

lower