You Are Significant!
1
What was the name of the Russian scientist who developed the framework of the Periodic Table?
Dmitri Mendeleev
Carbon
Lavoisier's law states: "Mass can neither be created nor destroyed?" What is the modern name of this popular scientific law?
0
How many sig figs in the number 30.20
4
Columns, going up and down the Periodic Table, are also known as what?
Groups (or Families)
What element has 19 electrons in its neutral state?
Potassium
What man, an English Professor, proposed his own Atomic Theory of Matter.
John Dalton
Sodium loses an electron to chloride (in a chemical process that forms table salt.) How many total electrons does Sodium now have AND what is its net charge?
10 electrons ; +1 net charge
How many sig figs in the final answer: (300) x (55) ?
1
Rows, going from left-to-right on the periodic table, are also known as what?
What element is Ni?
Nickel
What was the name of the man who discovered the electron and proposed the "Plum Pudding Model" for the atom?
J.J. Thomson
If Oxygen gains two electrons, what is its net charge?
-2
How many sig figs in the number 0.000257
3
What is another name for the elements that comprise Group 17?
What element is Pb?
Lead
What was the name of the Greek philosopher who first proposed the name "atomos" for the small indivisible units we now know as "atoms?"
Democritus
Br-80 is an isotope that has how many neutrons?
45 neutrons
20
Which of the following is an Actinide: Dy, Pa, Hf, or At?
Pa (Protactinium) #91
What element has nine protons?
Fluorine
Using the Gold Foil experiment, what was the name of the man who discovered the presence of the atom's dense center, known as the nucleus?
Ernest Rutherford
If Osmium's (Os) mass number is 190, how many neutrons does it have?
114 neutrons