atomic structure & reactivity\n1 mr. pauling needs you to prepare information about metals for his work on…
atomic structure & reactivity\n1 mr. pauling needs you to prepare information about metals for his work on armor prototypes. help him by completing the table about neutral atoms of the listed elements:\nelements number of protons number of electrons\naluminum\nsilicon\nberyllium\n2 use the table below to calculate the number of neutrons in each atom listed.\nelements rounded atomic mass atomic number number of neutrons\naluminum\nsilicon\nberyllium
Answer
Explanation:
Step1: Recall atomic - structure facts
In a neutral atom, the number of protons is equal to the number of electrons and is equal to the atomic number.
Step2: Find atomic numbers
The atomic number of aluminum (Al) is 13, so the number of protons and electrons in aluminum is 13. The atomic number of silicon (Si) is 14, so the number of protons and electrons in silicon is 14. The atomic number of beryllium (Be) is 4, so the number of protons and electrons in beryllium is 4.
Step3: Recall neutron - calculation formula
The number of neutrons = Rounded atomic mass - Atomic number.
Step4: Find neutron numbers
The rounded atomic mass of aluminum is 27 and its atomic number is 13, so the number of neutrons is $27 - 13=14$. The rounded atomic mass of silicon is 28 and its atomic number is 14, so the number of neutrons is $28 - 14 = 14$. The rounded atomic mass of beryllium is 9 and its atomic number is 4, so the number of neutrons is $9 - 4=5$.
Answer:
| Elements | Number of Protons | Number of Electrons |
|---|---|---|
| Aluminum | 13 | 13 |
| Silicon | 14 | 14 |
| Beryllium | 4 | 4 |
| Elements | Rounded Atomic Mass | Atomic Number | Number of Neutrons |
|---|---|---|---|
| Aluminum | 27 | 13 | 14 |
| Silicon | 28 | 14 | 14 |
| Beryllium | 9 | 4 | 5 |