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snow_lady [41]
3 years ago
13

Which sequence of group 18 elements demonstrates a gradual decrease in forces of attraction

Chemistry
1 answer:
DanielleElmas [232]3 years ago
8 0

Answer: Xe, Kr, Ar, Ne

Explanation:

Hope i helped please mark brainliest!

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How many grams of magnesium contain 4.80 x 10^25 atoms of magnesium
Aloiza [94]

Answer:

mass Mg = 1.937 Kg

Explanation:

from periodic table for Mg:

⇒ molecular mass Mg = 24.305 g/mol

∴ mol ≡ 6.022 E23 atoms

⇒ mol Mg = (4.80 E25 atoms)×(mol/6.022 E23 atoms)

⇒ mol Mg = 79.708 mol

⇒ mass Mg = (79.708 mol)×(24.305 g/mol)

⇒ mass Mg = 1937.3 g

⇒ mass Mg = 1.937 Kg

6 0
3 years ago
PLS HELP DUE IN ONE HOUR The atomic size of atoms increases as you move from top to bottom within a group of
weqwewe [10]

Answer:

Within a group trend

Explanation:

The atomic radius of atoms generally increases from top to bottom within a group trend. As the atomic number increases down a group, there is again an increase in the positive nuclear charge.  As the atomic number increases within a period, the atomic radius decreases.

3 0
3 years ago
Which of these is an example of chemical separation of a substance?
OleMash [197]

Answer:

Bond broking

Explanation:

Bond broking.

6 0
3 years ago
Calculate the percent composition of aluminum oxide (Al2O3). *Show how you got the answer please!*
Charra [1.4K]

Assume 1mol of Al2O3:

mm(Al) = 26.98g/mol

x2(moles needed in 1mol of Al2O3)

= 53.96g

~54g

mm(O) = 16.00g/mol

x3(moles needed in 1mol of Al2O3)

=48g

mm(Al2O3) = m(Al) + m(O)

= 102g/mol

x1mol

=102g (in 1 mol)

<em>What</em><em> </em><em>percent</em><em> </em><em>of</em><em> </em><em>the</em><em> </em><em>total</em><em> </em><em>does</em><em> </em><em>X</em><em> </em><em>or</em><em> </em><em>Y</em><em> </em><em>take</em><em> </em><em>up</em><em>?</em>

Just take the portion that it gets and divide by the total:

Al: 54/102 = 53%

O: 48/102 = 47% or 100%-53%=47%

<em>Notice that, with binary compounds, you only need to calculate one of the two elements: the remaining amount HAS to be taken up by the other element, or else there would be something else involved.</em>

3 0
3 years ago
The largest pieces being dragged along the streambed are undergoing the process called ________. pushing saltation traction susp
lianna [129]

Answer:

saltation

Explanation:

  • Saltation is the transportation of particles by fluids such as by winds and water.  It takes place when loose matter is removed from the sea bed and gets carried by the fluid back to the surface.
  • Examples include pebbles, sand, and soil. Saltation layers can form during avalanches.
8 0
3 years ago
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