The element with the smallest atomic radius among the given options is Calcium (Ca).

Here's the step by step reasoning:

1. Atomic radius generally increases as you move down a group (column) in the periodic table. This is because each row adds a new electron shell.

2. Similarly, atomic radius generally decreases as you move across a period (row) from left to right. This is due to the increase in the number of protons, which pulls the electrons closer to the nucleus.

3. Given the options Ca (Calcium), Sr (Strontium), Rb (Rubidium), and K (Potassium), we can see that they all belong to the same group (Group 2 for Ca and Sr, Group 1 for Rb and K), but are in different periods.

4. Calcium (Ca) is in the highest period (Period 4), which means it's the furthest to the right and thus has the smallest atomic radius among the given options.

Question

The element with the smallest atomic radius among the given options is Calcium (Ca).

Here's the step by step reasoning:

1. Atomic radius generally increases as you move down a group (column) in the periodic table. This is because each row adds a new electron shell.

2. Similarly, atomic radius generally decreases as you move across a period (row) from left to right. This is due to the increase in the number of protons, which pulls the electrons closer to the nucleus.

3. Given the options Ca (Calcium), Sr (Strontium), Rb (Rubidium), and K (Potassium), we can see that they all belong to the same group (Group 2 for Ca and Sr, Group 1 for Rb and K), but are in different periods.

4. Calcium (Ca) is in the highest period (Period 4), which means it's the furthest to the right and thus has the smallest atomic radius among the given options.

Knowee AI · Accepted Answer

The element with the smallest atomic radius among the given options is Calcium (Ca).

Here's the step by step reasoning:

1. Atomic radius generally increases as you move down a group (column) in the periodic table. This is because each row adds a new electron shell.

2. Similarly, atomic radius generally decreases as you move across a period (row) from left to right. This is due to the increase in the number of protons, which pulls the electrons closer to the nucleus.

3. Given the options Ca (Calcium), Sr (Strontium), Rb (Rubidium), and K (Potassium), we can see that they all belong to the same group (Group 2 for Ca and Sr, Group 1 for Rb and K), but are in different periods.

4. Calcium (Ca) is in the highest period (Period 4), which means it's the furthest to the right and thus has the smallest atomic radius among the given options.

Which element has atoms with the smallest radius?Group of answer choicesCaSrRbK

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