# Part d group 6a enter a signed integer for example 2

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Part D Group 6A Enter a signed integer. For example, +2 or -1 . +1 +2 +3
Correct Part E Group 7A Enter a signed integer. For example, +2 or -1 .
Correct Exercise 4.40: Problems - Protons, Neutrons, and Electrons A helium nucleus has two protons and two neutrons.
Part A How many electrons would it take to equal the mass of a helium nucleus? Express your answer using two significant figures. Correct Exercise 4.88: Problems - Isotopes How many neutrons are in an atom with the following atomic numbers and mass numbers? Part A = 28, = 58 Z A Correct Part B = 92, = 238 ANSWER: Correct Part C = 21, = 45 ANSWER: Correct Part D = 18, = 40 ANSWER: Correct Exercise 4.98: Problems - Atomic Mass Silicon has three naturally occurring isotopes: with mass 27.9769 and a natural abundance of 92.21%, with mass 28.9765 and a natural abundance of 4.69%, and with mass 29.9737 and a natural abundance of 3.10%. Part A N n Z A = 146 neutrons n Z A = 24 neutrons n Z A = 22 neutrons n Si 28 amu Si 29 amu Si 30 amu
Express your answer using four significant figures. . Part A What are the names of the elements symbolized by , , and , respectively? Spelling counts! Enter the names of the elements, separated by commas. Hint 1. How to approach the problem Many chemical symbols are based on the English name of the element. For example, the chemical symbol for oxygen is . Some elements, however, have symbols based on their Latin or Greek names. For example, the symbol for mercury is , from the Latin hydrargyrum . You should memorize the chemical symbols for common elements. ANSWER: Correct