Methane, CH4, is one carbon atom bonded to
four hydrogen atoms. In order to show how
carbon and hydrogen bond, the electron dot
configurations must be known for each
element. Which statement describes the
electron dot configuration for carbon when it
bonds with four hydrogen?
A. the carbon symbol C with two dots on the
left and right sides
B. the carbon symbol C with two dots on the
top and two dots on the bottom
C. the carbon symbol C with one dot on each
the top, bottom, left, and right sides
D. the carbon symbol C with two dots on the
top, two dots on the bottom, and one dot on
each side

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.  

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.