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Arlecino [84]
3 years ago
12

Can you tell from the periodic table exactly how many neutrons are in an atom?

Chemistry
1 answer:
tiny-mole [99]3 years ago
3 0

Answer: Yes

Explanation:

On the periodic table, you can find the element symbol, name, atomic number, and atomic mass. Just knowing the atomic mass and atomic number can give you the amount of neutrons. The atomic number states the amount of protons. The atomic mass is proton+neutron. Knowing this, you can subtract the atomic mass by the atomic number to get neutron.

Example: Carbon

Atomic number: 6

Atomic mass: 12.011 or 12

12-6=6                                                   [Atomic mass - Atomic number]

There are 6 neutrons in Carbon.

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Anvisha [2.4K]
Formula is Naf
charge is Flourine ion
symbol is ∨∨∨∨
hope that helped

4 0
3 years ago
If you were asked to convert 4.2 × 1022 atoms of aluminum to moles, which of the following should you use for the conversion?
gregori [183]
You should use Avogadro’s number for the conversion, because Avogadro’s Law states that there are 6.02 x 10^23 atoms per 1 mol of that substance.
4 0
3 years ago
Read 2 more answers
At standard temperature and pressure. 0.500 mole of xenon gas occupies
ANEK [815]

Answer:

0.500 mole of Xe (g) occupies 11.2 L at STP.

General Formulas and Concepts:

<u>Gas Laws</u>

  • STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 K

<u>Stoichiometry</u>

  • Mole ratio
  • Dimensional Analysis

Explanation:

<u>Step 1: Define</u>

<em>Identify.</em>

0.500 mole Xe (g)

<u>Step 2: Convert</u>

  1. [DA] Set up:                                                                                                  \displaystyle 0.500 \ \text{mole Xe} \bigg( \frac{22.4 \ \text{L Xe}}{1 \ \text{mole Xe}} \bigg)
  2. [DA] Evaluate:                                                                                               \displaystyle 0.500 \ \text{mole Xe} \bigg( \frac{22.4 \ \text{L Xe}}{1 \ \text{mole Xe}} \bigg) = 11.2 \ \text{L Xe}

Topic: AP Chemistry

Unit: Stoichiometry

3 0
2 years ago
Which of the following best shows two element combining to form a compound
marshall27 [118]

Answer:

there are no examples but 1 example is H2O which has 2 elements combining a compound.

Explanation:

6 0
3 years ago
Hydrogen fuel cells that operate at lower temperatures use more expensive platinum electrode catalysts.
mote1985 [20]
The correct answer is B) they operate at a higher efficiency. sorry hope the answers not to late :(
5 0
3 years ago
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