The organic compounds that are structural elements in the cell wall of plants and bacteria are known as

To calculate the number of atoms present in 2.0 mol of an element you would:

Andrews [41]

In order to figure out the number of atoms that are present in 2.0 mol of an element, you would multiply Avogadro's number of atoms per mole by 2.0 mole. Avogadroâ€™s is the number of units in one mole of a substance equal to 6.022140857 Ă— 1023.

4 0

4 years ago

Stems have all of these functions EXCEPT

Radda [10]

Answer:

B or A

Explanation:

choose wether A or B... give it a higher level of thinking. and good luck!

4 0

3 years ago

O

viva [34]

Answer:

The second and third option are isotopes of Bromine

Z= 35 A = 79

A = 79 N= 44

Explanation:

Step 1: What are isotopes ?

⇒ Elements with same atomic number (Z) ( this means the same number of electrons and protons) but a different number of neutrons (N)

The atomic number (visible on the periodic table) is the number of protons.

The atomic mass is the sum of the protons (Z) and neutrons (N), and is showed as 'A'. So A = Z+N

If we look at the periodic table, we can see that the atomic number of bromine (Z) = 35. This means the amount of protons = 35. Since isotopes have the same amount of protons, all isotopes of bromine, have 35 protons.

1) Z = 79, A = 196

Z = protons = electrons .So this element has 79 protons, as well as 79 electrons.

196 = 79 + N ⇒ N = 196 - 79 = 117 neutrons

⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Gold (Au): 196Au

2) Z = 35 , A = 79

Z = protons = electrons .So this element has 35 protons, as well as 35 electrons.

79 =35 + N ⇒ N = 79 - 35= 44 neutrons

⇒Since it does have 35 protons, it is an isotope of Bromine. This isotope has 44 neutrons

⇒ This is 79Br, which is a stable isotope of Bromine.

3) A=79, N = 44

Z = A - N ⇒ Z = 79 - 44 = 35

Z = protons = electrons .So this element has 35 protons, as well as 35 electrons. It also has 44 neutrons.

⇒Since it does have 35 protons, it is an isotope of Bromine, with 44 neutrons: 79Br

4) Z = 44, N = 44

Z = protons = electrons .So this element has 44 protons, as well as 44 electrons.

A = 44 + 44 ⇒ A = 88

⇒Since it doesn't have 35 protons, it isn't an isotope of Bromine, but of Ruthenium (Ru) : 88Ru

⇔So the second and third option are isotopes of Bromine

6 0

3 years ago

Referring only to the periodic table, tell:

denpristay [2]

a) Both fluorine and chlorine are in the same group in periodic table.

b) They differ in their atomic radius and electronegativity.

c) Because they have the similar number of electrons in their outer shell.

Explanation:

a) Electronic configuration of chlorine and fluorine are similar because these two elements belong to the same group number 17 of the periodic table as they have the same number of electrons in their outer or valence shell. These are called as halogens and are highly reactant.

F - 1s2,2s2,2p5 (9)

Cl- 1s2,2s2,2p6,3s2,3p5 (17)

b. The atomic radius of chlorine and fluorine are different because fluorine is on top of chlorine in the group. We know as we go down in a group in the periodic table the atomic radius increases though they have the same number of electrons in their outer shell electronegativity decreases. Fluorine is the most electronegative element of the periodic table.

c) Iodine and bromine are also the members of group 17, although their atomic numbers are different they have same valence electrons as chlorine and fluorine.

Iodine electronic configuration: 1s2,2s2,2p6,3s2.........4d10,5s2,5p5.

Bromine electronic configuration: 1s2,2s2,2p6,3s2,........3d10,4s2,4p5

Chlorine electronic configuration: 1s2,2s2,2p6,3s2,3p5

We can observe the outer shell having same number of electrons.

8 0

4 years ago

Color change is a good way to detect a chemical reaction. True or False?

Airida [17]

This is commonly true, but not always.

3 0

4 years ago

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