What is the nature of new elements added to the periodic table in the last hundred years? A. All were discovered naturally. B. All were synthesized artificially. C. Some were discovered and some were synthesized. D. No new elements have been added to the periodic table in that time.

Answer: C

Explanation: I just got it right on ck12

The periodic table is an arrangement of elements in rows and periods. The correct answer is option C. Some were discovered and some were synthesized.

In the modern periodic table, elements are arranged in order of increasing atomic numbers.

Most of the elements that were discovered before the 1900s were discovered naturally. After 1900, a few elements that occur naturally but are high radioactive with extremely short half lives have been discovered such as Technetium.

However, in the past 100 years, many elements have been synthesized  and added to the periodic table. To synthesize an element means to produce the element in a laboratory by bombarding an existing element with particles such as protons and neutrons.

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Select the correct answer from the drop-down menu.

Read the excerpt. Then choose the best way to complete the bulleted summary of the excerpt.

● There are three keys to identifying birds.
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● DROP DOWN MENU
A. Study maps of their migratory routes.
B. Encourage others to watch birds.
C. Listen to the sounds they make .
D. Draw a picture of a grassland habitat.
●Watch how they behave.
​

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A.physical change


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Which statement best identifies the meaning of this allusion? After Harriet Tubman escaped from slavery, she became a skilled guide on the Underground Railroad, Harriet Tubman was a Moses of her time. She was reckless and foolish. She found comfort in religion. She led her people to freedom. She was born into a high social status.

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authorities.
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O D. Fortunato seems not to trust Montresor and asks whether he is
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Symbolism
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AB GAME
A
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B
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READS
ESPOND
с
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