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Arisa [49]
2 years ago
10

Psychology is the scientific study of:

Chemistry
1 answer:
LuckyWell [14K]2 years ago
4 0

Answer: its D

Explanation:

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What is the electron configuration of an electrically neutral alkaline earth metal? please explain​
vlabodo [156]

Answer:

The elements in Group 2 (beryllium, magnesium, calcium, strontium, barium, and radium) are called the alkaline earth metals (see Figure below). These elements have two valence electrons, both of which reside in the outermost s sublevel. The general electron configuration of all alkaline earth metals is ns

8 0
3 years ago
What is Homogeneous?
Delicious77 [7]

Answer:

Explanation:

Hope that helps if not lmk have a wonderful day!

6 0
2 years ago
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How many moles of oxygen (O) atoms are in a sample of 3.98 × 1023 atoms? 0.661 mol O 1.51 mol O 6.60 × 1022 mol O 2.40 × 1047 mo
lidiya [134]
To find moles from any number of atoms, always divide by the constant called Avogadro's Number. This number is representative of the number of atoms or molecules in a mole of any substance and is equal to about 6.022* 10^{23} 
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So, for this problem, we take the number of atoms of oxygen and divide by Avogadro's Number. 

\frac{3.98*  10^{23}  O_{2} atoms  }{6.022*  10^{23} atoms/mol  } = 0.6609 moles

Answer: 0.661 moles (after rounding)

Make sense?
7 0
3 years ago
The Lewis dot model of a metal atom has two dots. Which of the following is true about the atom?
nataly862011 [7]

Answer : the statement that is true about the atom is It is present in the second group of the periodic table.

Explanation :

The Lewis dot model shows the number of valence electrons present in the atom.

Since the given metal has 2 dots, it indicates that the metal atom must have 2 electrons in its outermost shell.

Therefore option 2 : It has two electrons in the innermost energy level, is wrong because it contains 2 electrons in the outermost energy level

Option 1 : It is most likely to form covalent bonds is also wrong because a metal atom always forms ionic bond

Option 3 : It requires six other atoms to form a stable compound, is also wrong as the metal can form a stable compound by donating its 2 electrons to a non metal.

On periodic table, representative elements are arranged in groups based on their valence electrons. Therefore by knowing the outermost electrons, we can predict the group in which the element can be categorized.

Since the given metal atom contains 2 electrons, it must be present is second group.

Therefore the statement that is true about the atom is It is present in the second group of the periodic table.

6 0
2 years ago
Methionine, below, to show its zwitterion form.
snow_lady [41]
Would be meth like breaking bac
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