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Elena L [17]
4 years ago
13

Which of the following statements is true?

Chemistry
2 answers:
Shtirlitz [24]4 years ago
8 0

Answer: Elements in the last period are radioactive.

Explanation:

qwelly [4]4 years ago
5 0

Answer: Elements in the last period are radioactive.

Explanation:

Elements in the last period are all radioactive because they have an unstable nucleus. This period is known as the Actinides and contain elements such as Plutonium which occurs in nature and has the heaviest nucleus , while other elements are created artificially.

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Which elements have the most similar chemical properties?
Mumz [18]

Answer: K and Na

Explanation:

Potassium and Sodium have a chemical symbol of K and Na respectively.

They have similar chemical properties because both

- have only one valence electron,

- form univalent positive ion when they donate their lone outermost electron as shown below

Na --> Na+ + e-

K --> K+ + e-

- are good reducing agents

- react with cold water vigorously to liberate hydrogen gas and form alkalis, so they are known as alkali metals.

- K and Na are placed in Group 1 of the periodic table.

Thus, unlike the other pairs given, K and Na, have the most similar chemical properties

6 0
3 years ago
Explain why the several different types of microscopes are all necessary.
givi [52]
The different types of microscopes are all necessary because not all experiments require the same level of magnification. For dissections low magnification is sufficient, so a dissecting microscope works very well, while for viewing single cells the 1000 fold magnification of a compound light microscope is more accurate.
4 0
3 years ago
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erica [24]

Answer:

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Explanation:

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7 0
4 years ago
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What do the 14th Amendment and the Civil Rights Act of 1866 have in common?A. They were ways Congress sought to guarantee blacks
ehidna [41]
A. They were ways Congress sought to guarantee blacks the full rights of citizenship.
8 0
3 years ago
Provide two arguments on why you don't notice the land moving beneath you, defend your answer.​
AnnyKZ [126]

Answer:

The reference point is the ground.

Explanation:

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