3 years ago

What does the number below each element's symbol represent?

Chemistry

2 answers:

storchak [24]3 years ago

8 0

The answer to the question is B

marissa [1.9K]3 years ago

4 0

Answer:

B. The average atomic mass.

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The elements in period 3 all have what characteric

Anastasy [175]

The answer is that they all have metallic structures

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2 years ago

PLSSSS HELP I NEED ASAP

Liono4ka [1.6K]

Answer: C

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2 years ago

What is the expected mass (in kg) of a 10 over 5 B isotope? 1 proton = 1.6726 × 10-27 kg 1 neutron = 1.6749 × 10-27 kg A.1.67 ×

Ira Lisetskai [31]

$^{10}_5 B$
An atom of this isotope contains 5 protons and 10-5=5 neutrons.

$5 \times 1.6726 \times 10^{-27} + 5 \times 1.6749 \times 10^{-27} = \\
8.363 \times 10^{-27} + 8.3745 \times 10^{-27}= \\
16.7375 \times 10^{-27}= \\
1.67375 \times 10^{-26} \approx \\
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The answer is A. 1.67 × 10⁻²⁶ kg.

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3 years ago

at a certain pressure the density of superficial carbon dioxide is 0.469. what is the mass of a 25.0 mL sample of supercritical

Murrr4er [49]

Answer:

$\large \boxed{\text{11.7 g}}$

Explanation:

$\text{Mass} = \text{25.0 mL} \times \dfrac{\text{0.469 g}}{\text{1 mL}} = \textbf{11.7 g}\\\\\text{The mass of the carbon dioxide is $\large \boxed{\textbf{11.7 g}}$}$

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2 years ago

Why does water have a much higher boiling point than methane even though water (H20) and methane (CH4) molecules are approximate

PSYCHO15rus [73]

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Water has a higher boiling point because the hydrogen bonds that form water molecules are stronger than the Van der Waals interactions among methane molecules, therefor more energy must be provided in order to break the hydrogen bonds and allow the water molecules to escape the liquid state.

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2 years ago

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