A. How many protons are in one atom of fluorine - 19?
B. How many neutrons are in one atom of potassium - 39?
C. How many electrons are in one neutral atom of V - 51?
D. What is the symbol for the element that has 78 protons?
E. What is the symbol for the neutral atom that has 52 electrons?
I really suspect no one here is going to do this for you.
A. To find the number of protons in one atom of fluorine-19, you can refer to the atomic number of fluorine on the periodic table. The atomic number of an element represents the number of protons in its nucleus. In this case, fluorine has an atomic number of 9. Therefore, there are 9 protons in one atom of fluorine-19.
B. To determine the number of neutrons in one atom of potassium-39, you need to subtract the atomic number from the mass number. The atomic number represents the number of protons in an atom, while the mass number is the sum of protons and neutrons. The atomic number for potassium is 19. The mass number for potassium-39 is 39. By subtracting 19 from 39, you find that there are 20 neutrons in one atom of potassium-39.
C. To determine the number of electrons in one neutral atom of vanadium-51, you can refer to the atomic number of vanadium. The atomic number represents the number of protons in an atom, which is also equal to the number of electrons in a neutral atom since it is electrically balanced. In this case, vanadium has an atomic number of 23. Therefore, there are 23 electrons in one neutral atom of vanadium-51.
D. To find the symbol for the element that has 78 protons, you can refer to the periodic table. Each element is represented by a unique symbol. Locate the element with atomic number 78 on the periodic table, and you will find that it corresponds to the element with the symbol Pt, which stands for platinum.
E. To determine the symbol for the neutral atom that has 52 electrons, you can refer to the periodic table. Each element's symbol represents its unique identity. Find the element with 52 electrons, and you will discover that it corresponds to the element Te, which stands for tellurium.