You need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. First, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. If they meet these criteria, they will have similar properties.
The first pair: Ne (Neon) and Kr (Krypton), are noble gases found in group 8
The second pair: Li (Lithium) and K (Potassium), found in group 1
The third pair: S (Sulfur) and Te (Tellurium), found in group 6
There are four types of atomic orbitals s, p, d and f. All these atomic orbitals differ in their shapes.
s orbital: It is spherical in shape like a solid ball.
p orbital: It is dumbbell in shape.
d orbital: It is pear shaped in structure.
If two atoms** have the same number of protons, they are the same element. They have the same atomic number. The only thing that would change with the number of neutrons is the mass number.
Answer:
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