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Iteru [2.4K]
3 years ago
14

Which of the following statements is true about the periodic table? The atomic radius increases moving down a column. The atomic

radius decreases moving down a column. The chemical reactivity of metals increases moving from left to right. The chemical reactivity of nonmetals decreases moving from left to right.
Chemistry
2 answers:
lukranit [14]3 years ago
4 0
<span>The atomic radius increases moving down a column.

all the other options are wrong</span>
Nikitich [7]3 years ago
4 0

Answer: option (a) is the correct answer.

Explanation:

In a periodic table, when we move from top to bottom in a periodic table then there will be increase in number of shells because of addition of more number of electrons.

As a result, there will be increase in atomic radius of the atom.

Metals are the elements which have excess of electrons but on moving from left to right in a periodic table reactivity of metals decreases as there valence shells does not contain extra electrons to donate.

On the other hand reactivity of non-metals increases on moving from left to right.

Hence, we can conclude that the statement atomic radius increases moving down a column, is true about the periodic table.

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The density of solid Cr is 7.15 g/cm3. How many atoms are present per cubic centimeter of Cr?
Masja [62]
To calculate the number of atoms of Cr, we first find the number of moles per unit of cubic centimeter of Cr. Then, use avogadros number for the number of atoms. Calculations are as follows:

1 cm^3 (7.15 g/cm^3) (1 mol / 51.996 g Cr) = 0.14 mol Cr

0.14 mol Cr ( 6.022 x 10^23 atoms Cr / 1 mol Cr ) = 8.28 x 10^22 atoms Cr
8 0
4 years ago
What is the effect of this??
a_sh-v [17]

Answer:

Explanation:

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7 0
3 years ago
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Consider the model of the nitrogen atom.
liq [111]

Answer:

1s2 2s2 2p3

Explanation:

we know that the number of electrons in an atom is equal to number of protons. So the number of electrons here is 7.

Using Moller chart, the electronic configuration is writen by the electrons first enterring into 1s then into 2s after 2p. The s orbital accomodates maximum of 2 electrons.

∴ for atomic no. 7 nitrogen atom, electronic configuration is 1s2 2s2 2p3.

5 0
4 years ago
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Given the following Fischer projection: Fischer projection for an entantiomer of 2-bromo-2,3-dihydroxypropanal with the bromine
harina [27]

Answer:

Explanation:

Stereoisomers are two or more atoms that  have the same bonding order of atoms but there is a difference  spatial arrangement of  the  atoms in space.

A plane of symmetry divides a molecule into two equal halves.

A chiral stereoisomer are not superimposed on a mirror image , Hence they do not posses a plane of symmetry.

As a result to that. these non-superimposable mirror images are said to be Enantiomers.

However, a Fischer Projection emanates from a two - dimensional figure which is used for presenting a three - dimensional organic molecules.

From the given question;

Fischer projection for an enantiomer of 2-bromo-2,3-dihydroxypropanal with the bromine oriented horizontally to the left and the hydroxide group oriented horizontally to the right.

we can sketch the way the enantiomer of 2-bromo-2,3-dihydroxypropanal can  be seen like the one shown below:

              CH₂OH

                   |

                   |

                   |

Br -------------|----------------OH

                   |

                   |

                   |

                 CHO

The objective of this question is to drawn the perspective formula of the molecule.

So , from the attached file below; we can see the perspective formula of the molecule in a well structured 3-D format.

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3 years ago
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<span>Two characteristics used to classify igneous rocks are texture and </span>Mineral Grains

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