Sorry, that is incorrect.

The only correct answer is: 503 , 965 , 3458 , 4530

• 1000 , 2251 , 3361 , 4564 is not correct because there is no significant rise from the second to the third IE. Therefore, it is not a Group 2 element.
• 496 , 4563 , 6913 , 9544 is not correct because there is a significant rise between the first and second IEs, indicating a Group 1 element.
• 578 , 1817 , 2745 , 11578 is not correct because there is a significant rise from the third to the fourth IE, indicating a Group 3 element.

Sorry, that is incorrect.

The only correct answer is: 1 proton, 2 neutrons, and 1 electron.

• 2 protons, 1 neutron, and 2 electrons is incorrect because the number of protons and neutrons is reversed, and the number of electrons is incorrect.
• 1 proton, 2 neutrons, and 0 electrons is incorrect because an atom of $^{3}H$ contains one electron.
• 2 protons, 1 neutron, and 3 electrons is incorrect because the number of protons and neutrons are reversed and an atom of $^{3}H$ contains only one electron.

Sorry, that is incorrect.

The only correct answer is: $Na^{+}$ and $Mg^{2+}$

• $N^{3-}$ and $Cl^{-}$ is incorrect because the chloride ion has an extra shell of electrons compared to the nitride ion.
• $O^{2-}$ and $S^{2-}$ is incorrect because the sulfide ion has an extra shell of electrons compared to the oxide ion.
• $Na^{+}$ and $K^{+}$ is incorrect because the potassium ion has an extra shell of electrons compared to the sodium ion.

Sorry, that is incorrect.

The only correct answer is: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}$

• $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}$ is incorrect because this is the electronic configuration of $^{33}As^{3+}$
• $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{3}$ is incorrect because this is the electronic configuration of $^{33}As$
• $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{3}4d^{3}$ is incorrect because this has added electrons in the $4d$ orbital.

Sorry, that is incorrect.

The only correct answer is: $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p6$

• $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{2}$ is incorrect because two electrons have been removed instead of added to the sulfur atom.
• $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{4}$ is incorrect because this is the electronic configuration of the sulfur atom.
• $1s^{2} 2s^{2} 2p^{6} 3p^{6}$ is incorrect because this is the incorrect electronic configuration of the sulfur atom.

Sorry, that is incorrect.

The only correct answer is: anions and cations.

• atoms and delocalized electrons is incorrect because ionic bonding involves positive ions and negative ions
• cations and delocalized electrons is incorrect because there are no delocalized electrons in ionic bonding
• two nuclei and a shared pair of electrons is incorrect because this is a description of covalent bonding

Sorry, that is incorrect.

The only correct answer is: Fluoromethane ($CH_{2}F$)

• Hydrogen fluoride (HF) is not correct because fluorine is very electronegative and has a suitable lone pair of electrons for hydrogen bonding.
• Hydrogen peroxide ($H_{2}O_{2}$) is not correct because it has hydrogen bonding; compare with water.
• Methanol ($CH_{2}OH$) is not correct because alcohols can have hydrogen bonds; compare with water.

Sorry, that is incorrect.

The only correct answer is: acid-base 

• displacement is incorrect there Is no displacement taking place
• redox is Incorrect because neither substance is oxidized or reduced
• substitution is incorrect because there is no substitution taking place

Sorry, that is incorrect.

The only correct answer is: no change

• orange to green is not correct because tertiary alcohol is not oxidized
• green to orange is not correct because this is an incorrect colour change for acidified dichromate
• purple to colourless is not correct because this is an incorrect colour change for these reagents.

Sorry, that is incorrect.

The only correct answer is: electrophilic addition