Question

In: Biology

If an element has an atomic number of 7 and an atomic mass number of 15,...

If an element has an atomic number of 7 and an atomic mass number of 15, how many protons, neutrons, and electrons does it possess?

a) 7 protons, 8 neutrons, and 7 electrons

b) 7 protons, 8 neutrons, and 8 electrons

c) 8 protons, 7 neutrons, and 8 electrons

d) 15 protons, 8 neutrons, and 8 electrons

Solutions

Expert Solution

Number of electrons = Number of protons = Atomic number = 7

Number of neutrons = Mass number - atomic number = (15-7) = 8

Therefore, the correct answer is option a.


Related Solutions

Name the element with atomic number (Z) = 15 and atomic mass number = 31, Use...
Name the element with atomic number (Z) = 15 and atomic mass number = 31, Use the symbol, not the word. How many electrons does the neutral atom of this element have? Use a number, not a word. How many neutrons does the neutral atom of this element have? Use a number, not a word.
A hypothetical element Ec has an atomic number of 156 and an atomic mass of 300....
A hypothetical element Ec has an atomic number of 156 and an atomic mass of 300. 1. How many neutrons and electrons would be found in a neutral Ec atom? 2. If one proton were removed from Ec, would it still be the same element? 3. If one electron were to be gained by an atom of Ec, would it still be the same element? Would anything change about the element?
Element “X” has an atomic number of 16 and an atomic mass of 40 How many...
Element “X” has an atomic number of 16 and an atomic mass of 40 How many electrons are in the valence of Element X?
An element has an atomic number of 76. The number of protons and electrons in a...
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are?
Is Atomic Mass and Atomic Weight the same terms? Or is Atomic mass and Mass Number...
Is Atomic Mass and Atomic Weight the same terms? Or is Atomic mass and Mass Number the same terms? On the MCAT Kaplan books it says that atomic mass and mass number are the same thing but online and other chemistry textbooks, atomic mass and atomic weight are the same thing. Can someone please clarify which two terms are the same thing or are they all different? I really need help to make sure I understand this for the MCAT.
Helium has a mass of 4 atomic mass units and is the second lightest element after...
Helium has a mass of 4 atomic mass units and is the second lightest element after hydrogen. (i) Calculate the most probable speed of a helium atom in a gas at 295K. (ii) Sketch the Maxwell speed distributions of a helium gas and an argon gas at the same temperature.
A certain atom has an atomic mass of 19 and atomic number of 9? a. How...
A certain atom has an atomic mass of 19 and atomic number of 9? a. How many protons does it have? b. How many neutrons does it have? c. Using a periodic table, what element is this? d. If its charge is +2, how many electrons does it have?
An imaginary element, "X" has an atomic number of 43 and a massnumber of 85.00201....
An imaginary element, "X" has an atomic number of 43 and a mass number of 85.00201. How many protons does a neutral atom of this element contain?
Helium (He) has an Atomic Number Z=2 and an atomic mass of 4.002602. It has eight...
Helium (He) has an Atomic Number Z=2 and an atomic mass of 4.002602. It has eight isotopes. One of them is 9He (atomic mass number 9). a) How many protons are in a neutral 9He atom? b)  How many nucleons (that is protons and neutrons) are in a neutral 9He atom? c) How many electrons are in a neutral 9He atom? d) How many neutrons are in a neutral 9He atom?
Helium (He) has an Atomic Number Z=2 and an atomic mass of 4.002602. It has eight...
Helium (He) has an Atomic Number Z=2 and an atomic mass of 4.002602. It has eight isotopes. One of them is 6He (atomic mass number 6). a) How many protons are in a neutral 6He atom? b)  How many nucleons (that is protons and neutrons) are in a neutral 6He atom? c) How many electrons are in a neutral 6He atom? d) How many neutrons are in a neutral 6He atom?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT