Which element has the greatest average atomic mass?

Answers

Answer 1

Answer: The awnser is Hydrogen. It had the greatest average atomic mass

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What is the name of the compound Al2(SO3)3?

What is the hydronium ion concentration of a solution whose pH is 12.40?

Answers

Hydronium ion concentration = 3.98×10-13

The table below gives information about the nucleus of each 4 atoms Atom Number of protons Number of neutrons

A 6 6

D 6 7

G 7 7

E 7 8

How many different elements are represented by the nuclei in the table?

A 1

B 2

C 3

D 4

Answers

Atom Number of protons Number of neutrons. 2 elements are represented by the nuclei in the table

What is the difference between atomic number and atomic mass ?

Atomic number of an element is defined as total number of protons present in the nucleus, neutrons carry no net electrical charge, so it is the charge number of the nucleus.

atomic mass of an element can be defined as the atomic weight is measured total mass of an element’s atom, the total number of neutrons and protons in the nucleus of an atom.

Both Atomic mass and an atomic number of elements are closely related if atomic number is high, then the atomic mass is also said to be high.

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Answer:

Explanation:

BECAUSE IT IS B.

What mass of sodium hydroxide is needed to make 0.500 L of 2.50 M NaOH ?

Answers

Answer:

50 g NaOH

General Formulas and Concepts:

Chemistry - Solutions

Reading a Periodic Table
Using Dimensional Analysis
Molarity = moles of solute / liters of solution

Explanation:

Step 1: Define

0.500 L

2.50 M NaOH

x moles of solute

Step 2: Define conversions

Molar Mass of Na - 22.99 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H - 1.01 g/mol

Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol

Step 3: Find moles of solute

2.50 M NaOH = x moles NaOH / 0.500 L

x = 1.25 moles NaOH

Step 4: Convert

$1.25 \ mol \ NaOH((40 \ g \ NaOH)/(1 \ mol \ NaOH) )$ = 50 g NaOH

Step 5: Check

We are given 3 sig figs. Since our final answer has 2 sigs, there is no need to round.

Which object would best be identified by a periodic Doppler shift in a star's spectrum along with a dip in the stars light intensity?a black hole
a nebula
a comment
a planet

Answers

The answer would be a planet. Planets revolve around stars, which means there will come a point where the planet is between the star and our field of vision towards the star. This point will be where the star's radiation will have the lowest intensity. As the planet moves, the intensity will change. The effect is comparable to a lunar or solar eclipse.

Answer:

D. a planet

Explanation:

I just took the test!!!

What is the molar mass N
what is the molar mass U

Answers

The molar mass for N is 14.007 g/mol

The molar mass for U is 238.03g/mol

The molar mass is the same as mass number if it is only one element with no subscripts.

If it was H2O then it would be 18.016g/mol

The atomic number of an atom will always identify the amount of protons in its nucleus. If the atom is neutral, what else is identified by the atomic number? A. the number of neutrons in the atom B. the most common isotope of the atom C. the atomic mass of the atom D. the number of electrons in the atom

Answers

D.The number of electrons in an atom.In an atom,the number of protons and electrons are always the same which is indicated by the atomic number.Since we know that protons have a positive charge, and electrons have a negative charge this suggests that an atom is always neutral as +1-1=0.

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Why alkali metals are found in many common substances but are rarely found in pure form?

Dalton hypothesized that atoms are indivisible and that all atoms of an element are identical. It is now known that _____. A. all of Dalton's hypotheses are correct B. atoms of an element can have different numbers of protons C. atoms are divisible D. all atoms of an element are not identical but they must all have the same mass