elements and symbols
What is the symbol for potassium?
K
What is the vertical column of the periodic table called?
group
What do isotopes of the same element have in common?
Same number of protons
Who is credited with proposing the first atomic theory in the early 1800s?
John Dalton
How many electrons can the s sublevel hold
2
Which element has the symbol “Fe”?
Iron
Which group contains the alkali metals?
Group 1
If an atom has 11 protons and 12 neutrons, what is its mass number?
23
Which scientist discovered that atoms can release negatively charged particles?
J.J. Thomson
What is the maximum number of electrons the d sublevel can hold?
Which element is represented by the symbol “Pb”?
Lead
What group are the noble gases found in?
Group 18
If a potassium atom has 21 neutrons, what is its mass number?
40
Who preformed the gold foil experiment?
Ernest Rutherford
Write the electron configuration for sodium
1s² 2s² 2p⁶ 3s¹
What element has the symbol “Sn”?
Tin
Where are the metalloids located on the periodic table?
Along the staircase line
Calculate the average atomic mass: Cl-35 (75.8%) and Cl-37 (24.2%). What is the average atomic mass?
35.48 amu
What model did J.J. Thomson use to describe atoms?
Plum Pudding model
The ground-state electron configuration is 1s² 2s² 2p⁴. Name the element.
Oxygen (O)
Which element has the symbol “W”?
Tungsten
Which block of the periodic table contains the transition metals?
d-block
Calculate the average atomic mass: Mg-24 (79%), Mg-25 (10%), Mg-26 (11%), what is its average atomic mass?
24.32 amu
What did the gold foil experiment show?
Atom is mostly empty space, but contains a small positively charged nucleus
What is the electron configuration of Se?
[Ar] 4s23d104p4 or 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴