Question

name yulina t date _ hour _ 4. complete the following chart: isotope name atomic # mass # # of protons # of neutrons # of electrons uranium - 235 92 235 92 143 92 uranium - 238 92 238 92 146 92 boron - 10 boron - 11 part i: fill in the following chart element/ion atomic number number of protons number of neutrons number of electrons mass number ₁¹h 1 1 1 1 ₁¹h⁺ 1 1 1 ₆¹²c 6 6 6 12 ₃⁷li 3 3 3 7 ₁₇³⁵cl⁻ 17 17 18 17 + 1 = 18 35 ₁₉³⁹k 19 19 19 39 ₁₂²⁴mg²⁺ 12 12 12 + 2 = 14 24 ₃₃⁷⁵as 33 33 33 75 ₄₇¹⁰⁸ag⁺ 47 47 47 - 1 = 46 108 ₁₆³²s²⁻ 16 16 16 - 2 = 14 32 30 28 66 76 114 part ii: answer the following questions: 1. a. how can you tell if an atom has a negative charge? b. how can you tell if an atom has a positive charge? 2. define an isotope. 3. what would happen if the number of protons were to change in an atom?

Explanation:

Step1: Recall atomic - related facts

Atomic number = number of protons. For neutral atoms, number of electrons = number of protons. Number of neutrons = mass number - atomic number.

Step2: Fill boron - 10 row

Atomic number of boron is 5. So for boron - 10: atomic # = 5, mass # = 10, # of protons = 5, # of neutrons = 10 - 5=5, # of electrons = 5.

Step3: Fill boron - 11 row

For boron - 11: atomic # = 5, mass # = 11, # of protons = 5, # of neutrons = 11 - 5 = 6, # of electrons = 5.

Step4: Answer 1a

If an atom has more electrons than protons, it has a negative charge.

Step5: Answer 1b

If an atom has fewer electrons than protons, it has a positive charge.

Step6: Answer 2

Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.

Step7: Answer 3

Changing the number of protons in an atom changes the element.

Answer:

Isotope name	atomic #	mass #	# of protons	# of neutrons	# of electrons
boron - 11	5	11	5	6	5

1a. If number of electrons > number of protons.
1b. If number of electrons < number of protons.

1. Atoms of same element with same protons, different neutrons.
2. The element changes.