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3 years ago

What is the difference between a period and a group in the periodic table?

2 answers:

6 0

A period is horizontal; the elements gain 1 proton for each space moving left to right.
A group is vertical; the elements in each group have the same number of electrons in the valence shell(outer orbital).

Alexeev081 [22]3 years ago

3 0

In the periodic table, the vertical columns are called the “groups” or sometimes referred as “families.” They are called this because they have similar chemical properties. The horizontal rows on the period table are called periods because they all have same exact number of electron shells.

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A 800g/cm³ boulder has a density of 8g/cm³ what is the volume

PilotLPTM [1.2K]

6400 cubic centimeters

3 0

3 years ago

15 pts The drop down items have the same options for all sections labeled choose an item

cricket20 [7]

8) 21.504 liters of gas

9) 122.5 g

10) 6.022*10^23

Explanation:

1 mole= 22.4 liters

to calculate the volume of gas of 0.960 moles of CH4

22.4*0.960/1

= 21.504 liters of gas

2.0 mole*18.02 g/ 1 mole

=122.5 g

10)

2.0 l * 1 mole/22.4 l

6.022*10^23

8 0

3 years ago

How does the number of reactants in a double-displacement reaction

mojhsa [17]

In a typical double displacement reaction, you would have a total of two products (AB + CD —> AD + BC).

5 0

2 years ago

Which statement applies to electronegativity?

densk [106]

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

Electronegativity is defined as the tendency of an atom to attract the shared pair of electrons towards itself whenever a bond is formed.

This property increases as we move from left to right across a period because the number of charge on the nucleus gets increased and electrons are attracted more towards the nucleus.

This property decreases as we move from top to bottom in a group because the electrons get add up in the new shells which make them further away from the nucleus.

Thus, the correct answer is Option A.

7 0

3 years ago

Explain how the following experimental errors affect the final calculation of the kilocalories per gram for a food item. Be spec

Ainat [17]

Answer:

a) the final kilocalories per gram for food will be less because the mass was reduced

b)the final kilocalories per gram for food will be less since

c) the final kilocalories per gram for food will be less since the reaction will eventually go to completion

d) the final kilocalories per gram for food will be more.

Explanation:

a) the final kilocalories per gram for food will be less because the mass was reduced from 110.3 to 101.3g

b)the final kilocalories per gram for food will be less since some marshmallow fell off before the reaction

c) the final kilocalories per gram for food will be less since the reaction will eventually go to completion

d) the final kilocalories per gram for food will be more since the thermometer that got stuck will add to the value of final kilocalories per gram

6 0

3 years ago