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Mendeleev and the periodic table

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1. Why did Mendeleev leave three blank spaces in his periodic table?
2. Why do elements in a group of the periodic table have similar properties?
3. List five different metals give examples of how each metal is used.
4. List five different nonmetals. Give examples of how each nonmetal is used.
5. Why would you expect to find the element argon in its pure, uncombined form in nature?
6. An atom contains 74 protons, 74 electrons, and 108 neutrons. Which element is it?
7. Why can two different elements have similar atomic masses?

TRUE OR FALSE
1. The particles that move around outside an atom's nucleus are electrons.
2. Dmitri Mendeleev is credited with developing the first periodic table.
3. Noble gasses usually exist as compounds.
4. At the hot temperatures of stars electrons are stripped away from nuclei. This forms a dense phase of matter called a gas.

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https://brainmass.com/chemistry/oxidation-reduction-and-electrochemistry/mendeleev-and-the-periodic-table-68769

Solution Preview

1. Why did Mendeleev leave three blank spaces in his periodic table?

2. Why do elements in a group of the periodic table have similar properties?

ELEMENTS IN THE SAME GROUP HAVE SAME NUMBER OF VALENCE SHELL ELECTRONS. THEREFORE, THEY HAVE ALMOST SAME CHEMICAL PROPERTIES.

3. List five different metals give examples of how each metal is used.

Na = USED IN MAKING CHEMICAL SALTS FOR EXAMPLE COMMON SALT, IN MAKING BASIC SOLUTIONS

Fe = USED IN MAKING DIFFERENT ALLOYS

CU = IN ...

Solution Summary

Questions about properties of the periodic table, electron shells, and the structure of an atom.

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Short Answers for general chemistry, mainly related to atoms.

Question 6 True/False 20 points
The number of electrons in orbital 5f6 is 5 electons.
True
False

Question 7 Multiple Choice 20 points
Beginning at Argon, Ar, the electron configuration of a Copper atom (Cu) is:
[Ar]4s24d4
[Ar]4s24p63d3
[Ar]4s23d7
[Ar]3d104s1

Question 8 Multiple Choice 20 points
Beginning at Krypton, Kr, which element has the following electron configuration?
[Kr]5s24d105p2
Sn
Sb
Pb
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Question 9 True/False 20 points
One mol of Ga2O3 is equivalent to 433 grams.
True
False

Question 10 Multiple Choice 20 points
The 19th-century chemist credited with the modern arrangement of elements in the periodic table is:
Heisenberg
Mendeleev
Bohr
Meyer

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