What are superconductors?a. Materials that need high heat to transfer energy
c. Materials that only transfer thermal energy
b. Materials that transfer energy with no resistance
d. Materials that convert thermal energy into potential energy User: ______ is/are usually the best conductor/s.
a. Metals
c. Air
b. Water
d. Minerals

The element with the electron configuration 1s² 2s² 2p⁶ 3s² 3p² is silicon (Si).

In the electron configuration notation, each number and letter represents a specific energy level (or shell) and subshell that contains electrons in an atom. The numbers indicate the energy levels (principal quantum numbers), and the letters represent the type of subshell (s, p, d, or f).

Let's break down the electron configuration for silicon (Si):

1s²: This indicates that the first energy level (n = 1) has two electrons in the s subshell.

2s²: This indicates that the second energy level (n = 2) has two electrons in the s subshell.

2p⁶: This indicates that the second energy level (n = 2) has six electrons in the p subshell.

3s²: This indicates that the third energy level (n = 3) has two electrons in the s subshell.

3p²: This indicates that the third energy level (n = 3) has two electrons in the p subshell.

To find the element with this electron configuration, we count the total number of electrons: 2 + 2 + 6 + 2 + 2 = 14 electrons. Since silicon (Si) has 14 electrons, it matches the given electron configuration.

Silicon is a chemical element in the periodic table with atomic number 14. It is a metalloid, meaning it has properties of both metals and nonmetals. Silicon is widely used in various industries, including electronics, as it is a key component of semiconductors and is crucial for modern technology.

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Final answer:

Lithium is an element that has chemical properties most similar to sodium.

Explanation:

Out of the given options, lithium is the element that has chemical properties most similar to sodium.

Sodium and lithium are both in Group 1 of the periodic table, also known as the alkali metals. Alkali metals have similar properties because they all have one valence electron, which makes them highly reactive.

For example, like sodium, lithium reacts vigorously with water to produce hydrogen gas and a hydroxide:

2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g)

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