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3 years ago

An atom of sodium has 11 protons, 11 electrons,and 12 neutrons, what is its atomic number and mass number?

1 answer:

3 0

Example: A sodium atom contains 11 protons, so its atomic number is 11. Mass number is the total of the protons and neutrons together, and it is given the symbol A. Example: A sodium atom contains 11 protons and 12 neutrons; its mass number A is 23<span>.</span>

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Which property describes a mixture? It cannot be separated by physical methods. It has a single chemical composition. It cannot

natima [27]

Answer:

it cannot be separated by physical methods

Explanation:

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3 years ago

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Why is mercury the only metal to have been used in thermometers

MArishka [77]

I think because its the only one to be liquid at normal temperatures.

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3 years ago

Hey! Can someone please help me out?

sertanlavr [38]

Answer:

the answer is b

Explanation:

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2 years ago

How many moles are in 3.24 x 1020 particles of lead? (show work plz)

lesya [120]

<h3>Answer:</h3>

0.000538 mol Pb

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

3.24 × 10²⁰ particles Pb (lead)

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

Set up: $\displaystyle 3.24 \cdot 10^{20} \ particles \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ particles \ Pb})$
Multiply/Divide: $\displaystyle 0.000538 \ mol \ Pb$

<u>Step 4: Check</u>

<em>Follow sig fig rules and round. We are given 3 sig figs.</em>

Our final answer is in 3 sig figs, no need to round.

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3 years ago

Why do sea and ocean levels recede (more coast land is exposed) when the planet goes through a major ice age?

fomenos

This happens because ice is made up of water, and when that water freezes, it never goes back to land, thus there being less water on the coastline. But when the ice starts to melt, the water will even out quickly, and the water will go to the coastline, causing the tide to rise. Mark brainliest, please.

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3 years ago