Answer:
The atomic number of an element is the number of protons found in the nucleus of every atom of that element. Atomic number and is used to distinguish one element from another . The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
While, Mass number (atomic mass number or nucleon number), is the total number of protons and neutrons in an atomic nucleus. It is said to be approximately equal to the atomic mass of the atom expressed in atomic mass units.
Explanation:
In simple words ;
mass number = protons + neutrons
Atomic number = no of protons
Answer:
Gamma Rays are the most powerful kind of rays :p
Answer:
The compound is most likely to be MgCl2.
Explanation:
Let the element with 2 valence electrons be X
Element with atomic number 17 is Cl.
The compound formed can be obtained as follow:
1. X will lose the 2 valence electrons to form X^2+ as shown below:
X —> X^2+ + 2e- (1)
2. Two Cl atoms will receive the 2 electrons as shown below:
2Cl + 2e- —> 2Cl- (2)
3. Combine equation 1 and 2.
X + 2Cl 2e- —> X^2+ +2Cl- + 2e-
Cancel out the electrons
X + 2Cl —> X^2+ + 2Cl-
X + 2Cl —> XCl2
Now, X is a group 2 element since it has 2 valence electrons. Therefore, X is most likely to magnesium, Mg.
Mg + 2Cl —> MgCl2.
Therefore, the compound is most likely to be magnesium chloride MgCl2