Nort answer answer the following questions in the space provided.
1. abecital row of elements in the periodic table is called a(n)
2. the symbol for the element in period 2. group 13. is
elements that are good conductors of heat and electricity are
elements that are poor conductors of heat and electricity are
a vertical row of elements in the periodic table is called an).
the
y
of a substance to be hammered or rolled into thin sheets is called
would an element that is soft and able to be cut with a knife likely be a metal or a

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.