Problem 2
Why did Mendeleev not include krypton in his periodic table of \(1871 ?\)
Problem 3
Why did Mendeleev not include radium in his periodic table of \(1871 ?\)
Problem 4
Why did Mendeleev not include plutonium in his periodic table of \(1871 ?\)
Problem 5
Before Moseley's discovery in \(1913,\) the periodic law stated that physical and chemical properties tend to repeat periodically when elements are arranged according to what trend?
Problem 6
After Moseley's discovery in \(1913,\) the periodic law stated that physical and chemical properties tend to repeat periodically when elements are arranged according to what trend?
Problem 7
Which two elements in the fourth period violate the original periodic law as stated by Mendeleev?
Problem 8
Which two elements in the fifth period violate the original periodic law as stated by Mendeleev?
Problem 9
Vertical columns in the periodic table are referred to by what two terms?
Problem 10
Horizontal rows in the periodic table are referred to by what two terms?
Problem 11
What is the term for the elements that belong to Groups IA-VIIIA (Groups \(1,2,\) and \(13-18) ?\)
