Which arrangement is represented in the periodic table? a. a repeating pattern of outer electrons b. random order for atomic mass c. a reverse sequence for the number of neutrons d. repeating patterns of isotopes

Option (A) is the correct answer.

Explanation:

Elements that belong to the same group show similar chemical properties.

This is because elements that lie in the same group have same number of valence electrons. Hence, they tend to show same type of reactivity which makes them exhibit similar chemical properties.

For example, all alkali metals are very reactive in nature as all of them contain 1 valence electron.

Therefore, in a group pattern of outer electrons is repeating.

Thus, we can conclude that a repeating pattern of outer electrons is the arrangement which is represented in the periodic table.

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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