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Furkat [3]
4 years ago
9

The placenta develops from the outer cells of the

Biology
1 answer:
statuscvo [17]4 years ago
4 0
<span>blastocyst The outer layers of the blastocyst turn in to the trophoblast after implantation. The trophoblast forms the placenta.</span>
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I am picturing a lever. For the stronger one to apply more effort, they need to hold it in the middle which will carry most of the weight while the weaker person would need to carry it on one of the ends. Since the stronger person would act as a fulcrum, the pole becomes a "level" which proves that the weaker person carries less weight by only holding the end of the pole!

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3<br> Li<br> 6.941<br> how can i draw this?
Mashutka [201]
6.941 tells you the nucleon number (total number of protons and neutrons in the nucleus of an atom)
3 tells you the proton number( number of protons in the nucleus of an atom.)
When drawing this you must know the number of protons , electrons, and neutrons of that element. Well in this question, everything’s been given. No. of protons = 3
No. Of electrons = 3 *REMEMBER, NUMBER OF PROTONS AND ELECTRONS ARE EQUAL WHEN THE ELEMENT IS IN ITS ATOMIC FORM.
No. Of neutrons= 4 neutrons. When rounding 6.941, it is 7. Then simply subtract 7-3 to get 4.
Now time to draw this. First you must know the number of electron shells does lithium has. Since lithium is in period 2, it has 2 electron shells.
Then, you must know what is the valence electron of Li. It is 1, since it is a group I element/alkali metal.
Also remember the structure. Electron are surrounding the nucleus of the atom on electron shells while the nucleus is in the center of the atom. Nucleus contains the protons and neutrons. REMEMBER THE FIRST SHELL SHOULD CONTAIN ONLY 2 ELECTRONS WHILE THE SECOND SHELL WITH 8 ELECTRONS AND GO ON.
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