How many proton and Neutrons does Helium (He) have?
(mass #4.003)
Protons 2, Neutrons 2
100
What is the name of element number 106 and what is the atomic number?
Seaborgium, 106.
100
What are the names of the groups that are the most reactive groups in the s-block of the periodic table of elements?
Alkali Metals, Alkaline Earth Metals
100
Why he left some blank spots in his periodic table?
Because he predicted that there were future elements that would follow his pattern of his Periodic Table, and therefore he left them blank
200
Alkaline Earth Metals?
left
200
How many proton and Neutrons does Boron (B) have?
(mass #: 10.81)
Protons 5, Neutrons 6
200
What element has an atomic number of 92?
U, Uranium
200
Which group of elements play an important role in living organisms, and are also extremely valuable as strong, structural useful materials AND make up the d-block on the periodic table?
Transitional Metals
200
whats the atomic mass of Neon (Ne)??
20.17
300
Transition metals?
middle
300
How many proton and Neutrons does Aluminum (Al) have?
(mass #: 26.98)
protons 13, neutrons 14
300
What is the name of the element with the elemental symbol Zr?
Zirconium
300
The elements boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Ti), belong in which elemental group?
Boron Group
300
Who is credited for the creation of the periodic table which we use today?
Dmitri Mendeleev
400
Halogens?
Right
400
How many proton and Neutrons does oxygen (O) have?
(mass #: 16.00)
Protons 8, neutrons 8
400
Which element has 42 as its atomic number?
Mo, Molybdenum
400
Which elements belong in the Carbon Group?
Carbon (C), Silicon (Si), Germanium (G), Tin (Sn), and Lead (Pb)
400
How Mendeleev organized the periodic table?
He laid it out the way we do today, except vertically instead of horizontally.
500
Noble Gases?
Right
500
How many proton and Neutrons does Calcium (Ca) have?
(mass #:40.08)