Matriculation Chemistry Semester 1:Chapter 3(Periodic table)

How did Mendeleev arrange the elements in the periodic table?

• density

• atomic mass

• alphabetical

• melting point

Which of these elements has the greatest atomic radius?

• N

• Cl

• Cs

• H

The Periodic Table of the Elements is useful for revealing patterns and trends in the elements. Which statement accurately describes a pattern in the size of atomic radii in the Periodic Table of the Elements?

• Atomic radii increase from left to right across a period and increase from top to bottom in a group.

• Atomic radii increase from left to right across a period and decrease from top to bottom in a group.

• Atomic radii decrease from left to right across a period and decrease from top to bottom in a group.

• Atomic radii decrease from left to right across a period and increase from top to bottom in a group.

The symbols W, X, Y, and Z represent four elements shown on the outline of a periodic table.

Which element has the highest electronegativity?

• W

• X

• Y

• Z

The ionization potential of an element is the amount of energy required to remove an electron from an isolated atom or molecule. According to the periodic table, which of the following indicates the correct decreasing order of ionization energy?

• Cs > K > Na > Li

• Li > Na > K > Cs

• Li > K > Na > Cs

• Na > K > Li > Cs

Fluorine, chlorine, bromine, and iodine all have the same number of valence electrons and have a tendency to gain electrons. Which element has the greatest ionization energy and electronegativity?

• fluorine

• chlorine

• bromine

• iodine

Which of these elements has an electron structure most similar to that of element X?

• 1

• 2

• 3

• 4

According to the Periodic Table of the Elements, which set of elements has similar properties?

• He, H, Al

• He, Ne, Ar

• H, C, I

• Na, Ca, Al

What is the family name of this group of elements?

• Alkali Earth Metals

• Alkali metals

• Halogens

• Noble Gases

Electronegativity is ...