Respuesta :
Question 1
Adding an electron has no effect on the mass number but it reduces the atomic number by 1.Ā
So,Ā 234 91 Protactinium plus 0 negative 1 electron results toĀ Thorium234 andĀ
Ā Ā Ā Ā 7 4 Beryllium plus 0 negative 1 electron will result toĀ Lithium7
Adding a HeliumĀ particle increases the mass number of the daughter nucleiĀ by 4 and the atomic number by 2.
So,Ā 234 90 Thorium plus 4 2 Helium will results toĀ Uranium238 andĀ
Ā Ā Ā 222 86 Radon plus 4 2 Helium will result toĀ Radium226.
Question 2
The mass number isĀ 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. NeutronsĀ = 88 - 30 = 50.
Doing the same for the other elements we have;
14 6 CarbonĀ ā Neutrons = 14 - 6 = 8
Ā 127 53 IodineĀ āNeutrons = 127 - 53 = 74
4. 39 19 PotassiumĀ ā Neutrons = 39 - 19 = 20
Adding an electron has no effect on the mass number but it reduces the atomic number by 1.Ā
So,Ā 234 91 Protactinium plus 0 negative 1 electron results toĀ Thorium234 andĀ
Ā Ā Ā Ā 7 4 Beryllium plus 0 negative 1 electron will result toĀ Lithium7
Adding a HeliumĀ particle increases the mass number of the daughter nucleiĀ by 4 and the atomic number by 2.
So,Ā 234 90 Thorium plus 4 2 Helium will results toĀ Uranium238 andĀ
Ā Ā Ā 222 86 Radon plus 4 2 Helium will result toĀ Radium226.
Question 2
The mass number isĀ 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. NeutronsĀ = 88 - 30 = 50.
Doing the same for the other elements we have;
14 6 CarbonĀ ā Neutrons = 14 - 6 = 8
Ā 127 53 IodineĀ āNeutrons = 127 - 53 = 74
4. 39 19 PotassiumĀ ā 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. Ā āāProtactiniumĀ²Ā³ā“ +1eā» is matched with ThoriumĀ²Ā³ā“
2. Ā āāThoriumĀ²Ā³ā“ + āāHelium is matched with Lithium
3. Ā āāRadonĀ²Ā²Ā² + āHeliumā“ is matched with Ā UraniumĀ²Ā³āø
4. Ā āBerylliumā· + 1ā»e is matched with RadiumĀ²Ā²ā¶
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. āāStrontiumāøāø Ā
atomic number = 38
mass number = 88
neutrons = mass number - atomic number
neutrons =88-38 =50
2. āCarbonĀ¹ā“
atomic number = 6
mass number = 14
neutrons = mass number - atomic number
neutrons =14-6 =8
3. Ā ā āIodineĀ¹Ā²ā·
atomic number = 53
mass number = 127
neutrons = mass number - atomic number
neutrons =127-53= 74
4. āāPotassiumĀ³ā¹
atomic number = 19
mass number = 39
neutrons = mass number - atomic number
neutrons =39-19= 20
a. āāStrontiumāøāø ā 50
b. āCarbonĀ¹ā“ ā Ā 8
c. ā āIodineĀ¹Ā²ā· Ā ā 74
d. Ā āāPotassiumĀ³ā¹ā Ā 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
