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Yanka [14]
3 years ago
15

How many atoms are in al2o3

Chemistry
1 answer:
pentagon [3]3 years ago
6 0
<span>There are five. Two atoms of aluminum, and three atoms of oxygen.There are 5</span>
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Number of
SpyIntel [72]

Answer:

A = 8

B = 8

C = O ( Oxygen )

D = 26

E = 30

F = Fe (Iron)

Explanation:

1)To get "A" we use the following formula

mass number = number of protons + number of. neutrons

15 = number of protons + 7

15 - 7 = number of protons

8 = number of protons

A = 8

2)To find "B"

atomic number = number of protons

Atomic number = 8

B = 8

3)To find "C"

the atomic number is 8 so the element which

has 8 atomic number on periodic table is Oxygen.

C = oxygen

4) To get "D"

Number of protons = atomic number

number of protons = 26

D = 26

5)To get "E"

mass number = number of protons + number of. neutrons

56 = 26 + number of neutrons

56 - 26 = number of neutrons

number of neutrons = 30

E = 30

6) To find "F"

The atomic number is 26 so the element which has 26 atomic number on periodic table is Iron.

hope it helps

for any question comment me ❤❤

4 0
4 years ago
Question 1 (1 point) Which Major Plate is the largest tectonic plate? ​
S_A_V [24]

Answer:

pacific plate

Explanation:

7 0
3 years ago
What is the specific activity (in Bq/g) if 8.58 mg of an isotope emits 7.4x10⁴ α particles per minute?
Monica [59]

Specific activity is the activity per unit mass of a radionuclide and is a physical property of that radionuclide. Activity is a quantity (for which the SI unit is the becquerel) related to radioactivity, and is defined as the number of radioactive transformations per second that occur in a particular radionuclide.

<h3>How do you find the specific activity of an isotopes?</h3>

  •       Activity = λN.
  •       = (0.693/8 days) x (1/86,400 sec/day) x (3 x 1017 atoms)
  •       = 3 x 1011 atoms/sec I-131.
  •       = 3 x 1011 dps I-131.

<h3>What is the specific activity of Co 60?</h3>

The average specific activity of 60Co in continental aquatic sediments is in the region of 1 Bq. kg-1 dry weight (Eyrolle et al., 2008). Cobalt distribution in the abiotic compartments of continental aquatic systems is characterised by the strong affinity of the element for sediment.

Learn more about specific activity of isotopes here:

<h3>brainly.com/question/364529</h3><h3 /><h3>#SPJ4</h3>

6 0
2 years ago
State one reason the Sabin vaccine is was used more frequently than Salk vaccine.
EastWind [94]
The sabin vaccine had more qualities and benifets than the salk vaccine
3 0
3 years ago
What is the oxidation number for Ba?<br> A. +1<br> B. -2<br> C. +2<br> D. -1
kompoz [17]

Answer:

+2

Explanation:

Ba is present in group 2 and group 2 show + oxidation state

5 0
3 years ago
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