Respuesta :
Question 1
Adding an electron has no effect on the mass number but it reduces the atomic number by 1.
So, 234 91 Protactinium plus 0 negative 1 electron results to Thorium234 and
7 4 Beryllium plus 0 negative 1 electron will result to Lithium7
Adding a Helium particle increases the mass number of the daughter nuclei by 4 and the atomic number by 2.
So, 234 90 Thorium plus 4 2 Helium will results to Uranium238 and
222 86 Radon plus 4 2 Helium will result to Radium226.
Question 2
The mass number is the sum of protons and neutrons. If an element has y protons and x neutrons, then its mass number will be (y+x).
88 38 Strontium. This element has a mass number of 88 and atomic number(number of protons) 38. Neutrons = 88 - 30 = 50.
Doing the same for the other elements we have;
14 6 Carbon ⇒ Neutrons = 14 - 6 = 8
127 53 Iodine ⇒Neutrons = 127 - 53 = 74
4. 39 19 Potassium ⇒ Neutrons = 39 - 19 = 20
Adding an electron has no effect on the mass number but it reduces the atomic number by 1.
So, 234 91 Protactinium plus 0 negative 1 electron results to Thorium234 and
7 4 Beryllium plus 0 negative 1 electron will result to Lithium7
Adding a Helium particle increases the mass number of the daughter nuclei by 4 and the atomic number by 2.
So, 234 90 Thorium plus 4 2 Helium will results to Uranium238 and
222 86 Radon plus 4 2 Helium will result to Radium226.
Question 2
The mass number is the sum of protons and neutrons. If an element has y protons and x neutrons, then its mass number will be (y+x).
88 38 Strontium. This element has a mass number of 88 and atomic number(number of protons) 38. Neutrons = 88 - 30 = 50.
Doing the same for the other elements we have;
14 6 Carbon ⇒ Neutrons = 14 - 6 = 8
127 53 Iodine ⇒Neutrons = 127 - 53 = 74
4. 39 19 Potassium ⇒ Neutrons = 39 - 19 = 20
(1. The options 1,2,3 and 4 are matched by the b,c, a,d respectively.
(2.) The options 1,2,3 and 4 are matched by the b,c,d, a respectively.
What is the atomic number?
A chemical element's atomic number, also known as its proton number, is the number of protons contained in the nucleus of each atom of that element.
A chemical element is identified by its atomic number. It is the same as the nucleus' charge number.
(1) options 1,2,3 and 4 are matched by the b,c, a,d respectively.
When we add an electron it causes no effect on the mass number but due to which atomic number is reduced by 1.
1. ₉₁Protactinium²³⁴ +1e⁻ is matched with Thorium²³⁴
2. ₉₀Thorium²³⁴ + ₄₂Helium is matched with Lithium
3. ₈₆Radon²²² + ₂Helium⁴ is matched with Uranium²³⁸
4. ₄Beryllium⁷ + 1⁻e is matched with Radium²²⁶
Hence options 1,2,3 and 4 are matched by the b,c, a,d respectively.
(2.)The options 1,2,3 and 4 are matched by the b,c,d, a respectively.
As we know that the mass number is equal to the sum of protons and neutrons.
1. ₃₈Strontium⁸⁸
atomic number = 38
mass number = 88
neutrons = mass number - atomic number
neutrons =88-38 =50
2. ₆Carbon¹⁴
atomic number = 6
mass number = 14
neutrons = mass number - atomic number
neutrons =14-6 =8
3. ₅₃Iodine¹²⁷
atomic number = 53
mass number = 127
neutrons = mass number - atomic number
neutrons =127-53= 74
4. ₁₉Potassium³⁹
atomic number = 19
mass number = 39
neutrons = mass number - atomic number
neutrons =39-19= 20
a. ₃₈Strontium⁸⁸ ⇒ 50
b. ₆Carbon¹⁴ ⇒ 8
c. ₅₃Iodine¹²⁷ ⇒ 74
d. ₁₉Potassium³⁹⇒ 20
Hence options 1,2,3 and 4 are matched by the b,c,d, a respectively.
To learn more about the atomic number refer to thr link;
https://brainly.com/question/4206478
