Atomic Number
This element has an atomic number of 15.
Phosphorus (P)
Silicon has a mass number of …
28
The Periods are the horizontal rows or the vertical columns?
Horizontal rows
The Groups are the horizontal rows or the vertical columns?
Vertical rows
The elements in Groups 1-3 all (lose or borrow) valence electrons?
Lose
Fluorine has an atomic number of …
9
The element with an anatomic number of 4 is ….
Be
Chlorine is located in Period …..
3
This Group of elements are known as the Noble Gases
Group 18
Elements in Group 17 _____ electrons.
Borrow
Which element has the highest atomic number, Oxygen (O) or Magnesium (Mg)?
Magnesium (Mg)
This element has the same atomic number and mass number.
Hydrogen (H)
Elements with 4 energy levels are found in Period ….
Period 4
The elements in this group have 2 valence electrons.
Group 2
This is the least reactive group of elements.
Group 18 (Noble Gases)
This element has 13 protons and 14 neutrons is ….
Aluminum (Al)
This element's total number of protons and neutrons is 23.
Sodium (Na)
What is the relationship between energy levels and and Periods?
They are the same
This element has only one valence electron.
Hydrogen (H)
True or False: Elements with 2 valence electrons, except Helium, are more reactive than elements with 8 valence electrons.
True
The atomic number of the element in Period 4 Group 2 is…
20 Calcium (Ca)
This element in Group 16 has a mass number that is twice as much as the atomic number.
Sulfur (S)
Which element has the fewest energy levels Be, He, Na?
Helium (He)
This element has 4 energy levels and 8 valence electrons.
Krypton (Kr)
Which element is more reactive between Chlorine and Argon?
Chlorine