1
Q
what element does Pb stand from??
A
Lead
2
Q
what is the letter sign for Tin on the periodic table???
A
Sn
3
Q
How many oxygen atoms are in this equation??? CaCO3
A
3 oxygen atom
4
Q
where are the halogens
A
group 7
5
Q
is the atomic number the higher or lower number??
A
lower number
6
Q
how many known elements are there??
A
118 know elements!!!!
7
Q
where are the electrons located
A
on the outer shells
8
Q
where are the protons located
A
in the muscles
9
Q
where are the neutrons located
A
in the nucleus
10
Q
what is an element
A
a pure substance made from one atom
11
Q
what is in the 1st group
A
alkali metals
12
Q
what group are the noble gases
A
group 8
13
Q
what is the surname of the person who put forward the layout of our modern day periodic table??
A
Mendeleev
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