I think it’s c. Krypton (Kr)
D. Sodium (Na) Explanation: An atom grows as the number of electron shells increases; therefore, the radius of atoms increases as you go down a certain group in the periodic table of elements.
Atomic Radius: In the periodic table, from left to right, the moving atomic radius decreases as the effective nuclear charge increases, which strongly attracts the valence electron and also moves towards the nucleus, accordingly, the size of the atom decreases.
On the periodic table; in any group, the size of the atom increases with downward motion because the sizes of orbitals increase due to successive increases in major quantum levels.
Cadmium has a larger atomic radius than sulfur because it is present to the left and down the periodic table compared to sulfur.
Cadium Over a period, the atomic radii decrease from left to right due to the increase in the number of protons and electrons over a period.
The atomic radius of sulfur is 88 pm The atomic radius of chlorine is 79 pm The atomic radius of cadmium is 161 pm The atomic radius of fluorine is 42 pm The atomic radius of oxygen is 48 pm. The atomic radius of a chemical element is a measure of the size of its atoms. It is usually the average or typical distance between the center of the nucleus and the edge of the surrounding electron cloud.
Answer 6
Explanation: Over a period, the atomic radii decrease from left to right due to the increase in the number of protons and electrons over a period: when a proton is added, the attraction of electrons towards the nucleus is greater , so the size of the atom decreases. Thus, you can compare elements belonging to the same period and predict that the atom with the lowest atomic number (number of protons) will have the highest atomic radius. Thus: Oxygen and fluorine are in period 3, oxygen being to the left of fluorine, so oxygen is greater than fluorine. Sulfur and chlorine are in period 4, sulfur is to the left of chlorine, so sulfur is greater than chlorine. Now see what happens in a group. Atomic radius increases from top to bottom within a group due to electronic shielding. This allows you to compare the size of elements in a group: fluorine and chlorine are in the same group (17), with chlorine directly below fluorine, so the atomic radius of chlorine is greater than the atomic radius of fluorine. Sulfur and oxygen are in the same group (16), with sulfur directly below oxygen, so the atomic radius of sulfur is greater than the atomic radius of oxygen. So far you can classify the atomic radius of sulfur, chlorine, fluorine and oxygen, in ascending order as: O < F < Cl < S, concluding that O, F and Cl have an atomic radius greater than smaller than S. Cadmium, Cd, is to the left and below sulfur, so both electron shielding (below one group) and proton number increase (below one period) lead to the prediction that cadmium has a larger atomic radius than sulfur.
Answer 7
I think the best answer would be A.
K ) because when moving from left to right in a period, no. number of electrons and protons increase one by one, but the valence shell remains the same, thus increasing the net atomic charge on the electrons, which causes the valence shell to shrink and therefore the atomic radius decreases going from left to right . in a period.
Sodium for a given class of elements, the lower the compound on the table, the greater the radius. since sodium is lower on the table of elements than lithium and they are in the same class, it is larger.
the answer is cadmium
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