Elements in the same period in the periodic table have the same
A. number of shells
B. atomic number
C. chemical properties
D. physical properties?
Ugh, in a series (period) the elements do have the same number of energy levels ... it is in groups (families) of elements that chemical properties are consistent. I would have selected 'A'. :-)
I just wrote a treatise on why A couldn't possibly be correct but just before posting I reread the question and saw I had made a mistake. The question is about periods and I read it as groups. and my answer is correct for groups (families). Periods are different and A is better answer.
its A because if they are in the same period they all have the same electron shells.
Nope. Guess again. Can't be A. Try C
Its A all the elements in a period have the same amount of shells
Its a clutz'
The correct answer is A. number of shells.
To understand why, let's explore the periodic table. The periodic table is a tabular arrangement of chemical elements, organized based on their atomic number (the number of protons in an atom's nucleus). The table is divided into rows called periods. Each period corresponds to a different energy level or shell in which the electrons of the elements are organized.
As you move across a period from left to right, the atomic number increases, indicating an increase in the number of protons in the nucleus. This means more electrons are added to the same energy level or shell.
Elements in the same period have the same number of shells because they share the same principal energy level. For example, in the second period (row) of the periodic table, elements have two shells: the first shell filled with 2 electrons, and the second shell filled with 8 electrons. So all elements in the second period have two shells.
Elements in the same period do not have the same atomic number because the atomic number increases as you move across a period from left to right.
As for option C. "chemical properties," elements in the same period generally exhibit different chemical properties. This is because chemical properties are mostly determined by the number and arrangement of electrons in the outermost (valence) shell, which varies across a period. The physical properties, option D, can also differ within a period due to varying factors such as atomic size, ionization energy, and electronegativity.
Therefore, the correct choice is A. number of shells.