Selenium (Se) the most common isotope of this element. The nucleus consists of 34 protons (red) and 46 neutrons (blue).
Answer:
A is correct
Explanation:
B speaks of the skeletal system
C speaks of the respiratory system
D speaks of the thoracic cavity and respiratory system
- Hope that helps! Please let me know if you need further explanation.
Answer:
C
Explanation:
Because that's the spin in its orbitals.
The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.
Answer: E = - 19.611× J
Explanation: The lowest possible energy can be calculated using the formula:
where:
Z is atomic number of the atom;
k is a constant which contains other constants and is 2.179× J
n is a layer;
For the lowest possible, n=1.
Atom of Lithium has atomic number of Z=3
Substituing:
J
<u>The energy for the electron in the </u><u> ion is - 19.611 joules</u>