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Aloiza [94]
3 years ago
13

Use the drop-down menus to complete each sentence.

Chemistry
2 answers:
Murrr4er [49]3 years ago
7 0

Answer:

1. group 2.period 3. less 4. more

Explanation:

Ipatiy [6.2K]3 years ago
3 0

Explanation:

Elements that belong to same group contains same number of valence electrons. Hence, they tend to show similar chemical properties.

When we move across a period then number of electrons get added to the same shell. As a result, there will be no increase in size of elements.

Also, metals are the elements that belong to group 1, 2 and d-block elements are also known as metals. Metallic character of elements decreases when we move left to right in a periodic table.

As most reactive metals are placed on the left side of periodic table.

Since, size of elements increases on moving down the group. So, an element is able to easily lose its valence electrons because of less force of attraction between its nucleus and valence electrons.

As a result, there will be increase in reactivity of metals on moving down the group.

Thus, we can conclude that given sentences are as follows.

  • Elements in the same group have the same number of valence electrons.
  • Elements in the same period have the same number of electron shells.
  • Metallic elements become less reactive as you move left to right in a period.
  • Metallic elements become more reactive as you move top to bottom in a group.
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Travka [436]

Answer:

Proxima Centuri is 9 orders of magnitude further from New York compared to Perth

Explanation:

Distance of Proxima Centuri to New York = 4 × 10^16 meters

Distance of Proxima Centuri to Perth = 11000 miles

Since 1 mile = 1609 meters, distance to Perth in meters = 11000 × 1609

Distance to Perth = 17699000 = 1.7699 × 10^7 meters

Order of magnitude of the distances of Proxima Centuri to New York and Perth = 10^16/10^7

Order of magnitude = 10^9

Therefore, Proxima Centuri is 9 orders of magnitude further from New York compared to Perth.

3 0
3 years ago
Which statements are consistent with Dalton"s atomic theory as it was originally stated? Why? a. Sulfur and oxygen atoms have th
Vlad [161]

The question is incomplete, the complete question is:

Which statements are consistent with Dalton's atomic theory as it was originally stated? Why?

a. Sulfur and oxygen atoms have the same mass.

b. All cobalt atoms are identical.

c. Potassium and chlorine atoms combine in a 1:1 ratio to form potassium chloride.

d. Lead atoms can be converted into gold.

<u>Answer: </u>The correct options are b) and c).

<u>Explanation:</u>

Some of the postulates of Dalton's atomic theory are:

  • All matter is made of very tiny particles called atoms that participate in chemical reactions
  • Atoms are indivisible particles that cannot be created or destroyed in a chemical reaction
  • Atoms of a given element are identical in mass and chemical properties
  • Atoms of different elements have different masses and chemical properties.
  • Atoms combine in the ratio of small whole numbers to form compounds.
  • The relative number and kinds of atoms are constant in a given compound.

For the given options:

<u>For a:</u>

The statement is inconsistent with the theory as no two elements can have the same mass. Only atoms of the same element can have the same mass.

  • <u>For b:</u>

This is consistent with the theory as atoms of the same element are identical.

  • <u>For c: </u>

This is consistent with the theory as atoms combine in a simple whole number ratio.

  • <u>For d:</u>

The statement is inconsistent with the theory as atoms of one element cannot be changed to atoms of other element.

Hence, the correct options are b) and c).

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borishaifa [10]
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s344n2d4d5 [400]

Answer:

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Explanation:

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