Periodicity

Posljednje ažuriranje over 1 year ago

Periodicity

Posljednje ažuriranje over 1 year ago

What does the periodic law state?

Properties of elements repeat periodically when arranged by atomic number

Elements in the same group have the same proton number

Elements are arranged by atomic mass

Elements' properties correlate with their electron configuration

Which elements have similar chemical properties?

Elements in the same group

Elements with the same atomic weight

Elements with the same atomic number

Elements in the same period

Which group on the periodic table is most reactive?

Group 8: Noble gases

Group 1: Alkali metals

Group 2: Alkaline earth metals

Group 17: Halogens

Which block of the periodic table contains the transition metals?

F-block

D-block

S-block

P-block

What block of the periodic table are the transition metals located in?

D-block

S-block

F-block

P-block

Which block of the periodic table contains elements with completely filled electron shells?

Halogens (P-block)

Alkali metals (S-block)

Noble gases (P-block)

Transition metals (D-block)

What group in the periodic table do lanthanides and actinides belong to?

S-block

D-block

F-block

P-block

In which block of the periodic table are group 1 alkali metals found?

D-block

S-block

F-block

P-block

What group in the Periodic Table contain the noble gases?

Group 18

Group 1

Group 17

Group 2

Why are noble gases unreactive?

They have no neutrons

They have less atomic mass

They have full electron shells

They lack protons

Which noble gas is used in 'neon' advertising signs?

Helium

Argon

Neon

Xenon

How many valence electrons does Neon (Ne) have?

What is the number of electrons of the outermost shell for noble gases?

8, excluding Helium

How many valence electrons does an atom in Group 17 have?

How many valence electrons does sulfur have?

Why do elements in the same group have similar chemical properties?

They have the same atomic number

They have the same number of valence electrons

They have the same atomic mass

They have the same number of energy levels

In terms of electron configuration, why is helium (He) considered a noble gas?

It has no valence electrons

It has a single energy level

Its outermost energy level is full

It has 8 valence electrons

Which group of the periodic table contains elements with two valence electrons?

Group 18

Group 1

Group 3

Group 2

What is the maximum number of valence electrons that an atom in s- or p-block can have in its outermost shell?

What happens to the atomic radius as you move from left to right across a period in the periodic table?

The atomic radius increases

The atomic radius remains constant

The atomic radius decreases

There is no discernable pattern

Which factor primarily causes the decrease in atomic radius across a period?

Increase in electron shielding

Decrease in electron-electron repulsion

Decrease in principal quantum number

Increase in effective nuclear charge

Why does atomic radius increase as you move down a group in the periodic table?

Additional energy levels are added, increasing the distance

More neutrons are added, increasing the radius

More protons are added, increasing the radius

More electrons are added, increasing the repulsion

Which of the following elements has the smallest atomic radius?

Hydrogen (H)

Neon (Ne)

Helium (He)

Lithium (Li)

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

It stays the same

It decreases

It increases

It fluctuates unpredictably

What is the trend in atomic size as you move across a period from left to right?

There's no observable trend

Atomic size decreases

Atomic size increases

Atomic size stabilizes

Why does the ionization energy tend to increase as you move across a period from left to right?

Electrons are added to the same energy level

Atomic radius increases

Nuclear charge increases and atomic radius decreases

More energy levels are added

Which element would likely have the lowest first ionization energy?

Helium(He)

Oxygen(O)

Fluorine(F)

Francium(Fr)

An ion with 10 protons, 10 electrons and 11 neutrons is isoelectronic with what element?

Beryllium (Be)

Lithium (Li)

Boron (B)

Neon (Ne)

Why do elements in the same group on the periodic table have the same number of valence electrons?

They have the same number of protons

They have the same atomic number

They have the same atomic mass

They have the same outer electron configuration

What changes in an atom when it becomes a cation?

It loses electrons

It loses protons

It gains electrons

It gains neutrons

Which of the following elements is more likely to form a cation?

Nitrogen

Sodium

Fluorine

Oxygen

What effect does the loss of electrons have on the atomic size of a cation?

It has no effect on the atomic size

It decreases the atomic size

It oscillates the atomic size

It increases the atomic size

What charge does a cation carry?

None

Positive

Negative

Neutral

What happens to the atomic radius of an anion compared to its original atom?

It remains the same

It depends on the atom type

It becomes smaller

It becomes larger

Why does an atom form an anion?

It loses electrons to release energy

It wants to increase atomic radius

It gains electrons to reach stable energy levels

Atom cannot form anions

What charge does an anion carry?

Neutral charge

Negative charge

Both negative and positive charges

Positive charge

Which of the following elements is more likely to form an anion?

Helium

Argon

Neon

Fluorine

What does the electron shielding effect explain?

Decrease in atomic size down a group

Increase in atomic size across a period

Increase in ionization energy down a group

Decrease in electronegativity across a period

Which electron shell experiences the least shielding effect?

Last shell (farthest from the nucleus)

Second shell

Third shell

First shell (closest to the nucleus)

Why does electron shielding decrease ionization energy?

It increases the energy of the electrons

It decreases the energy of the electrons

Because it reduces the pull of the nucleus on electrons

Because it increases the pull of the nucleus on electrons

How does electron shielding affect atomic radius?

It causes the atomic radius to fluctuate

It has no effect on the atomic radius

It decreases the atomic radius

It increases the atomic radius

Why do the Noble Gases (Group 18) have low affinity to electrons?

They easily lose electrons

Their outer energy levels are already filled

They have small atomic radii

They have high ionization energy

Which element has the highest electronegativity?

Fluorine

Hydrogen

Oxygen

Nitrogen

How does electronegativity change across periods in the periodic table?

It decreases

It stays the same

There's no specific pattern

It increases

Why do atoms with higher electronegativities tend to attract bonding electrons?

They have more energy levels

They have stronger nucleus-electron attractions

They have more protons

They have a higher atomic mass

In bonding, which type of atom tends to receive electrons?

An atom with higher atomic mass

An atom with higher atomic number

An atom with higher electronegativity

An atom with lower electronegativity

Which chemical property is more closely associated with metals?

They tend to gain electrons

They are poor conductors of heat and electricity

They tend to lose electrons

They have low melting points

What is a characteristic property of nonmetals in the periodic table?

Usually good conductors of heat and electricity

Most are in the liquid state at room temperature

Generally poor conductors of heat and electricity

They tend to lose electrons easily