# Number of negatively charged electrons to maintain

• 23
• 75% (16) 12 out of 16 people found this document helpful

This preview shows page 16 - 19 out of 23 pages.

number of negatively charged electrons to maintain charge neutrality, in a neutral atom the number of protons is also equal to the number of electrons.
Part A Sort the following elements by the number of protons in an atom of each. Drag the appropriate elements to their respective bins. Hint 1. How to approach the problem The element symbol is used to identify an element. Most periodic tables display the one- or two-character element symbol prominently within each cell. The atomic number, which is the number of protons in each atom of that element, is most often displayed either above or to the upper left of the element symbol. Find each element in the periodic table, and locate the atomic number. That atomic number is equal to the number of protons. Hint 2. Identify the parts of a cell in the periodic table Identify the components of a cell in the periodic table. Drag the appropriate labels to their respective targets. ANSWER: ANSWER: Help Reset mass number atomic number element symbol atomic mass
2/26/2019 Ch 4 HW 17/23 Correct Part B Determine the number of neutrons in each of the following atoms given the mass number and atomic number. Match the numbers in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer. Hint 1. How to approach the problem Start by identifying the mass number and atomic number for each atom. Then, use the atomic number to find the number of protons. Once you know the number of protons in the atom, you can apply the equation mass number = number of protons + number of neutrons to find the number of neutrons in each atom. Hint 2. Determine the number of protons in an atom How many protons are in an atom of aluminum with a mass number of 24 and an atomic number of 13? Express your answer as an integer. ANSWER: Hint 3. Rearrange the equation to solve for neutrons Which of the following properly rearranges the equation mass number = number of protons + number of neutrons to find the number of neutrons in an atom? ANSWER: Reset Help 13 protons in aluminum = number of neutrons = mass number + number of protons number of neutrons = mass number / number of protons number of neutrons = mass number - number of protons He Be Ne Cu Sb Ce 2 4 10 29 51 58
2/26/2019 Ch 4 HW 18/23 ANSWER: