Periodic Law

Front

Who arranged the first periodic table?

Back

Mendeleev

Front

Which sequence of elements is arranged in order of decreasing atomic radii?

Back

Al, Si, P

Front

Which of the following has the lowest electronegativity?

Back

selenium (Se)

Front

Identify the period and group of the element that has the electron configuration [Ne] 3s² 3p³.

Back

Period 3 group 5A

Front

As you move across the periodic table from left to right, the atomic radius decreases. Why?

Back

The number of protons increases, so attraction to electrons increases.

Front

What is the periodic law?

Back

The properties of elements are a periodic function of their atomic numbers.

Front

Define atomic radius.

Back

The distance from the nucleus of an atom to the outermost shell of electrons.

Front

What trend is observed in electronegativity across a period?

Back

Electronegativity increases from left to right across a period.

Front

What is the relationship between atomic number and the number of protons?

Back

The atomic number of an element is equal to the number of protons in its nucleus.

Front

What happens to ionization energy as you move down a group in the periodic table?

Back

Ionization energy decreases as you move down a group.