Attempts of elements classification

.............. is the number of positive protons inside the nucleus of the atom of an element

• Atomic number

• atomic size

• atomic radius

What is the place of an element with atomic number 6?

• Group 4A period 1

• Group 4B period 2

• Group 4B Period 1

• Group 4A period 2

There is ............ elements in the modern periodic table

• 118

• 119

• 117

• 67

Who arranged the elements according to their atomic numbers?

What are the blocks of the modern periodic table?

• S

• P

• D

• F

Who corrected the atomic weights of some elements?

Who classified the elements of periodic table in an ascending order according to their atomic weights?

• Mendeleev

• Moseley

• Bohr

• Rutherford

What is the number of energy levels in the heaviest atom?

Which of the following elements lie in the same period in the periodic table with Mg ₁₂ ?

• N ₇

• P ₁₅

• Li ₃

• Ca ₂₀

The atomic number of an element that exists in group 7a and period 2?

• 12

• 7

• 9

• 17