Question 1.) match the parent nuclei with the daughter nuclei. these are the parent nuclei 1. 234 91 protactinium plus 0 negative 1 electron 2. 234 90 thorium plus 4 2 helium 3. 222 86 radon plus 4 2 helium 4. 7 4 beryllium plus 0 negative 1 electron these are the daughter nuclei a. uranium238 b. thorium234 c. lithium7 d. radium226 question 2.) match the elements with the number of neutrons. (4 points) these are the elements 1. 88 38 strontium 2. 14 6 carbon 3. 127 53 iodine 4. 39 19 potassium these are the number of neutrons a. 20 b. 50 c. 8 d. 74

(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.

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;

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