Answer:
1st group (or 1A in some tables)
Explanation:
Mass number = number protons + number neutrons
23 = number protons + 12
number protons = 23 - 12= 11, so atomic number is 11.
Sodium (Na) has an atomic number 11.
Sodium is in the 1 group, or 1A group in some Periodic tables.
- C2H4 + H20 --> C2H5O
- <span>C3H8 + Cl2--> C3H7Cl +HCl
- </span><span>C2H2+Br2 --> C2H2Br2</span>
- C4H10+Br2 --> C4H10+HBr
- <span>C3H6 + BR2 --</span>> C3H6BR2
Answer:
This question is incomplete and unclear; the complete question including the missing part is:
Emelie is working on a science project. Her task is to answer the question:
"Does Rogooti (a hair cream sold on TV) affect the speed of hair growth
(in length)". Her family is willing to volunteer for the experiment. Identify the control group (CG) and the independent and dependent variables.
ANSWER:
Independent variable: Rogooti hair cream
Dependent variable: Speed of hair growth/length
Control group: Family members that do not use the Rogooti hair cream
Explanation:
In an experiment, the independent variable is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this case, the ROGOOTI HAIR CREAM is the independent variable.
Dependent variable refers to the variable that is measured or the variable that responds to the change made to the independent variable. In this case, the dependent variable is SPEED AT WHICH HAIR GROWS (IN LENGTH).
Control group in an experiment is the group that does not receive the experimental treatment. In this case, the experimental treatment is the Rogooti hair cream, hence, the control group will be the VOLUNTEER FAMILY MEMBERS THAT DOES NOT RECEIVE THE ROGOOTI HAIR CREAM ON THEIR HAIR.
A compound has to have at least two different elements in
(1) is the only list in which each of the three symbols representations show at least two different elements
Phosphorus has 5 valence
valence electrons is located to their group#
yes because of TAVE available valence electrons