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Agata [3.3K]
3 years ago
12

The model below shows a calcium atom.

Biology
2 answers:
algol133 years ago
7 0

Answer:

B.8

Explanation:

Ca=20

K L M N

2 8 8 2

The third energy level of an atom (with atomic number 20 and above) contains 8 electrons.

malfutka [58]3 years ago
4 0

first energy level:1s2=2 electrons

2nd energy level:2s2 2p6=8 electrons

<em><u>3rd energy level 3s2 3p6=8 electrons</u></em>

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Explanation:

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All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. To produce daughter cells, the chromosomes (total number of chromosomes (2n)) are copied before the cell splits into two daughter cells. This process is known as mitosis, and occurs in cell division and growth processes. Two new nuclei are formed, along with identical cells. These are the same as the parent cell and the chromosome number (2n) is maintained. Conversely in meiosis, the number of chromosomes (2n) is halved through meiotic divisions, producing 4 (n) germ cells (sperm or eggs), each containing half the number of chromosomes as its parent cell.

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