Answer:
False
Explanation:
In physical change chemical composition stay the same, does not change.
Nonessential amino acids can be made by the body, while essential amino acids cannot be made by the body so you must get them from your diet.
Nonessential acids : glutamine, proline, glycine etc
Essential acids: lysine, leucine etc.
Answer:
Tobacco use: The most preventable cause of cancer death
Explanation:
cancer might not be right
Explanation:
Periodic table has vertical columns and horizontals rows.
Periods: The horizontal rows are named as periods in a periodic table.In a period elements with same numbers of principle quantum number ('n') or total number of shells (energy levels) are present. For example : Sodium comes in third period which means that sodium has three shells in total.
Groups: The vertical columns are named as group in a periodic table. In a group elements with same number electrons in their outermost shell are present. For example: In group one all the elements Li, Na, K etc have same number of valence electrons in their outermost shell.
So, in order to place a newly discovered element in a periodic table scientist must have the information regarding the number of valence electrons and total number of shells present in an atom of that element. One can easily look for valence number of electrons and total number of shells from the atomic number of that particular element.
By the knowledge of valence electrons and total number of shells the scientist will able to decide the group number and period number for newly discovered element.