Potassium and nickel are in the same row of the periodic table. What do these elements have in common? (1 point)
• They have the same number of electron shells.
• They have the same number of valence electrons.
• They have similar physical properties.
• They have similar reactivity.
• They have the same number of electron shells.
Potassium and nickel are in the same row of the periodic table. What do these elements have in common? (1 point)
• They have the same number of electron shells.
• They have the same number of valence electrons.
• They have similar physical properties.
• They have similar reactivity.
• They have the same number of electron shells.
Why do elements that are in the same group of the periodic table share similar properties?
(1 point)
• They are all metals.
• They are all very reactive with other elements.
• They all have the same number of electrons in the outer shell.
• They all have the same atomic mass.
• They all have the same number of electrons in the outer shell.
Potassium and nickel are in the same row of the periodic table. What do these elements have in common? The correct answer is: They have the same number of electron shells.
To determine what characteristics potassium (K) and nickel (Ni) share, we can refer to the periodic table and some basic periodic trends.
First, let's verify that potassium and nickel belong to the same row on the periodic table. The rows on the periodic table are called periods. Potassium is in period 4, and nickel is also in period 4. So, they are in the same row.
Now, let's evaluate each of the given options to see which one applies to both potassium and nickel:
1. They have the same number of electron shells:
To determine the number of electron shells, we look at the period number. Since both potassium and nickel are in the same period (period 4), they have the same number of electron shells. This statement is true.
2. They have the same number of valence electrons:
Valence electrons are the electrons present in the outermost energy level or electron shell of an atom. To find the number of valence electrons, we can examine the group number or column number. Potassium is in group 1, and nickel is in group 10. Thus, potassium has 1 valence electron, while nickel has 2 valence electrons. This statement is false.
3. They have similar physical properties:
Physical properties such as melting point, boiling point, density, and appearance are not determined solely by an element's position on the periodic table. Therefore, we cannot conclude that potassium and nickel have similar physical properties solely based on being in the same row. This statement is not necessarily true.
4. They have similar reactivity:
Reactivity refers to an element's tendency to undergo chemical reactions. The reactivity of an element is determined by its position in the periodic table and its electron configuration. While both potassium and nickel can react with other elements to form compounds, their reactivity is not considered similar. Potassium is highly reactive and vigorously reacts with water and air, while nickel is relatively unreactive. This statement is false.
Based on the analysis, the correct answer is:
• They have the same number of electron shells. (1 point)