WorksheetsPeriodicity I
Total questions: 20
Worksheet time: 10mins
Across a period from left to right , atomic radius
decreases
increases
increases, then decreases
decreases, then increases
Atomic radius generally increases as we move __________.
down a group and from right to left across a period
up a group and from left to right across a period
down a group and from left to right across a period
up a group and from right to left across a period
Which of the following elements has the smallest atomic radius?
Sulfur
Chlorine
Aluminum
Sodium
Why doesn't having more protons increase the attraction down a column?
there are more valence electrons in the outermost energy level
actually, there aren't more protons in the nucleus down the column
as energy levels are added, non-valence electrons block the extra protons from attracting ve-
more neutrons block the extra protons
P, Cs, Co, Sr
When Zeff increases, the nucleus attraction
towards electrons become
Weaker
Stronger
Remain the same
What happens to atomic radius across a period?
the atoms get bigger because the nucleus is bigger as more protons are added
the atoms get bigger because there are more ve-
the atoms get smaller because with more attraction to the extra protons, the e- cloud moves closer to the nucleus
What is meant by isoelectronic species?
Groups of atoms and ions which have the same valence electrons.
Groups of atoms and ions which have the same electronic configuration.
Groups of atoms and ions which have the same n.
The properties of elements can be deduced from electronic configurations. Which statement is true about Na+ ion, Cl- ion, Ar atom and K+ ion?
Na+ ion is bigger than Cl- ion.
The charge density of Na+ ion is lower than that of Cl- ion.
The ionisation energy of K+ ion is higher than that of Na+ ion.
Cl- ion, K+ ion and Ar atom have the same electronic configuration.
Going down the group, the atomic radius of elements increases. Why is that so?
the number of shell (n) increases
Shielding effect increases
Nucleus attraction towards valence electrons weaker
All of the above
Atomic radius is...
the relative size of the atom's nucleus
the relative size of the atom's electron cloud
the energy required to shield the outer electrons from the nucleus
a measure of the ability of an atom to attract electrons
Across a period atomic size become smaller because
Attraction within nucleus decrease
Effective nucleus charge increase (Zeff)
Effective nucleus charge decrease (Zeff)
Repulsion within electron increase
Atomic radius generally increases as we move __________.
down a group and from right to left across a period
up a group and from left to right across a period
down a group and from left to right across a period
up a group and from right to left across a period
Electronegativity __________ from left to right within a period and __________ from top to bottom within a group.
decreases, increases
increases, increases
increases, decreases
stays the same, increases
