2 years ago

Which is the correct choice

Chemistry

1 answer:

umka21 [38]2 years ago

4 0

Answer:2 Fr because is has the lowest electronegativity 0.79

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Where do you find an elements energy levels

ahrayia [7]

You can find an element's amount of energy level by determining their place on the periodic table. An element's amount of energy levels are represented by which period/ row they are in. For example, Calcium has 4 energy levels. I know this because it is in the fourth period on the table.

Hope this helps!

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3 years ago

How many moles are in 24.75 g of H2O? What is given the conversation and the unknown?

riadik2000 [5.3K]

Answer:

1.373 mol H₂O

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic Table
Using Dimensional Analysis

Explanation:

Step 1: Define

24.75 g H₂O

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

$24.75 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O} )$ = 1.37347 mol H₂O

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

1.37347 mol H₂O ≈ 1.373 mol H₂O

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2 years ago

What is the Einstein theory of relevancy

Alinara [238K]

E=mc (square) E= mass times capacity squared

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3 years ago

isotopes of an element have the same number of protons but a different number of neutrons below u will see the nucleus of four d

dexar [7]

What is your question? Its not clear

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3 years ago

My science exam is due tomorrow and I HAVE LIMITED TIME. can someone help me how to absorb anything you read and memorize it...

igor_vitrenko [27]

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1 year ago