it must be 12.
Chromium is the element in period 4 and group 6.
It is indium(In) which is in 5th period in group IIIA (or group 13).
Gold belongs in gruop 11 and period 6 in the periodic table. Otherwise known as a transition element. Gold (symbol: Au, atomic number:79) is a metal in d-group (transition elements). Exact place is period 6, group 11.
Period 3. In the periodic table of elements you can decipher which period does an element belong by looking by the number of ROWS and which number is your element included in.
It tells you the number of cations in the outer energy level of the element's atomic mass
The element with the lowest atomic number in period 3 is sodium (Na) with an atomic number of 11.
When going left to right across a period, the atomic number of element increases.
The element that has an atomic number of 36 is Krypton, a noble gas in period 4.
you mean atomic number and it is 28
copper
The reason Argon is the last element in its period is that it has the highest atomic number in its period, and that's the way all periods are arranged.
From atomic number 55 to 86
Calcium is a non metal element. Atomic number of it is 20.
Increasing atomic number by 1
Boron
For elements it's the atomic number not the "Period Number." This number tells you how many protons a single atom of that element has in its nucleus. The "period number" is a dimensionless quantity used in fluid dynamics.
No element in period 3 has an atomic mass of 12.