Which factor primarily causes atomic radius to decrease across a period?
A. Increasing electron shells
B. Increasing nuclear charge
C. Decreasing neutron number
D. Decreasing shielding effect
Why is the ionic radius of O²⁻ larger than the atomic radius of O?
A. Loss of protons
B. Increased electron repulsion
C. Reduced nuclear charge
D. Change in orbital shape
Which element has the largest atomic radius in Period 3?
A. Potassium (K)
B. Chlorine (Cl)
C. Sodium (Na)
D. Silicon (Si)
Arranged the following ions in a increasing order (smallest to largest)of ionic radius?
Al3+
Na+
Cl-
P3-
Br-
S8 has a higher melting point than P4 due to more electrons leading to a stronger pd-pd force.
Which group has the lowest melting points in the periodic table?
A. Alkali metals
B. Noble gases
C. Halogens
D. Alkaline earth metals
The relative magnitude of the property X of five elements is shown. P, Q, R, S and T are all in Period 3 and have consecutive atomic numbers.
A
B
C
D
Which statements describe a trend in Period 3 between every pair of adjacent elements from sodium to phosphorus?
A. The atomic radius decreases
B. The 1st ionisation energy increases.
C. The melting point increases
D. The nuclear charge increases
Which element in Period 4 could have the second-lowest first ionisation energy and the second-highest melting point
A. Aluminium
B. Gallium
C. Magensium
D. Bromine
Which statements about this graph are correct?
1. Elements B, J and R are in Group 18 of the Periodic Table.
2. Atoms of elements D and L contain two electrons in their outer shells.
3. Atoms of elements G and O contain a half-filled p subshell.
4. Atoms of element F and N have the height melting point in its period.
What is the formula of the ionic compound formed from these elements?
A. MgCl2
B. CaBr2
C. Na2S
D. K2Se
This question refers to isolated gaseous species.The species F–, Ne and Na+ are isoelectronic. This means they have the same number of electrons.
A.
B.
C.
D.
What could be the first element of this sequence?
A. C
B. N
C. F
D. Na
Arrange the following element in a decreasing order of their first ionisation energy.
Chlorine
Phosphorus
Sulfur
Silicon
Magnesium
Aluminium
Sodium
Which topic in this lesson do you find most challenging?