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MakcuM [25]
4 years ago
6

What are the elements whose discovery added an entirely new column to mendeleev's periodic table?

Chemistry
2 answers:
navik [9.2K]4 years ago
8 0
The noble gases were the elements.
dimulka [17.4K]4 years ago
8 0
Hey there,
The elements are known as the noble gases.
Noble gases: <span>make up a group of chemical elements with similar properties</span>

Hope this helps :))

~Top
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The atomic mass of the elements M,X and Q are 6,11 and 17 respectively. Use the valency electrons to explain how the atoms M and
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Answer:

M is Li, X is boron, and Q is oxygen.  MX is LiB, lithium bromide.  QX is BO, boron oxide (not Body Odor).

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Lithium reacts with bromine since it happily donates it's single 2s electron to bromine's 4p orbital to fill bromine's 4s and 4p valence orbitals to go from 7 to 8 valence electrons, it's happy state.

Boron reacts with oxygen to form B2O3, which I'll happily write as O=BOB=O, since my name is Bob.  This is more complex, but both elements want to move electrons around in order to reach a more stable electron configuration.  Boron has 3 valence electrons and oxygen has 6.  So each oxygen needs 2 electrons to fill it's outer shell and boron is happy to lose it's 3 valence electrons to reach an outer shell equiovalent to helium.  So 2 borons contribute a total of 6 electrons, and the 3 oxygens have room for a total of 6 electrons to fill their outer shell.

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3 years ago
What are some unique properties about ice that differ from liquid water to water vapor
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7 0
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How many moles of copper are present in 75.0g Cu? Show your complete calculation and give the answer in the correct number of si
velikii [3]

Answer:

The answer to your question is 1.2 moles of copper

Explanation:

Data

mass of copper = 75 g

moles = ?

Process

1.- Look in the periodic table for the atomic mass of copper.

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2.- Use proportions to determine the moles of copper in 75 g

                          63.55 g of copper -------------------- 1 mol

                          75 g of copper       --------------------  x

Use cross multiplication

                          x = (75 x 1) / 63.55

                          x = 75 / 63.55

                          x = 1.18 moles ≈ 1.2 moles of copper

3 0
4 years ago
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#1: Which of the following statements is true?
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