#1
Who is credited with the discovery of the periodic law?
#2
Which of the following elements was not known at the time of Mendeleev's periodic table?
#3
Which scientist discovered the first periodic relationship among the elements?
#4
What term is used to describe the vertical columns in the periodic table?
#5
Who is known for arranging the elements in order of increasing atomic number?
#6
Which of the following elements has the highest electronegativity?
#7
Who was the scientist that discovered the electron?
#8
Which element has the highest atomic number?
#9
Who is credited with the discovery of radioactivity?
#10
Which element is the most abundant in the Earth's crust?
#11
What was the main criterion Mendeleev used to organize elements in his periodic table?
#12
Who proposed the concept of periodicity of elements based on the atomic number?
#13
Who was the first to propose a periodic classification of elements?
#14
What is the most electronegative element on the periodic table?
#15
Which group of elements in the periodic table is known for their high reactivity?
#16
Who proposed the concept of the 'law of octaves'?
#17
What did Henry Moseley use to determine the atomic numbers of elements?
#18
Which scientist introduced the concept of 'valence' to explain chemical bonding?
#19
Who developed the concept of electronegativity?
#20
Which of the following elements has the highest melting point?
#21
Which group of elements in the periodic table is known as the 'noble gases'?
#22
Which element is placed directly below magnesium in group 2 of the periodic table?
#23
Which of the following is a synthetic element created by human intervention?
#24
What element did Dmitri Mendeleev predict with remarkable accuracy before its discovery?
#25