# Calculating Valence Electrons in Si 1cm3 Crystal

• matt222
In summary, to calculate the number of valence electrons in a 1cm3 crystal of silicon, you will need to know the density of silicon and calculate the mass. Convert the mass to Avogadro's number and remember that each atom has a valence shell. Be careful with your numbers and use a periodic table to ensure accuracy. Also, keep in mind that 1cm3 is equal to 1cm x 1cm x 1cm, not just 3cm.
matt222

## Homework Statement

calculate how many valence electrons there are in a 1cm3 crystal of silicon?

## The Attempt at a Solution

the outer shell of si element has 4 electrons, i think this is my answer

No I think you need to know the density of Si, and calculate mass. Convert mass in grams to avagadros number. Each atom has a valence shell.

every atom does have a valence shell but some are stable gases. careful with the numbers. try using a periodic table to ensure your answer and rmb 1cm3 is 1cm x 1cm x 1cm. don't just x3 it. many people make these mistakes

## 1. How do you calculate the number of valence electrons in a Si 1cm3 crystal?

The number of valence electrons in a Si 1cm3 crystal can be calculated by multiplying the number of Si atoms in the crystal by the number of valence electrons in one Si atom, which is 4.

## 2. What is the formula for determining the number of Si atoms in a 1cm3 crystal?

The formula for determining the number of Si atoms in a 1cm3 crystal is Avogadro's number (6.02 x 10^23) divided by the molar mass of Si (28.09 g/mol) and multiplied by the density of Si (2.33 g/cm3).

## 3. How do you find the molar mass of Si?

The molar mass of Si can be found by adding the atomic masses of each element in the compound Si, which is 28.09 g/mol. This information can be found on the periodic table.

## 4. What is the density of Si?

The density of Si is 2.33 g/cm3. This information can also be found on the periodic table.

## 5. Why is it important to calculate the number of valence electrons in a Si 1cm3 crystal?

Calculating the number of valence electrons in a Si 1cm3 crystal is important because it helps us understand the chemical and physical properties of the crystal. Valence electrons are responsible for bonding and determining the reactivity of an element, so knowing the number of valence electrons in a crystal can give us insight into its behavior and potential applications.

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