72, 144, 216, 288, 360, 432, 504, 576 +72 . . .
No. A number cannot be a multiple of a number greater than it. 18 is greater than 8 so 8 cannot be a multiple of 18. Nor is 8 a factor of 18. The factors of a number are those numbers which divide into it without remainder.
18/8 = 22/8 which simplifies to 21/4
5 8/18 Work out how many 18s go into the top number, until there is a remainder, in this case 5 18s go into 98 and leaves us with 8 spare.
LCM = 168
The number 8 is the factor of 18. But 8 is not a multiple of 6.
no
The isotope oxygen-18 has the mass number of 18. The atomic number of oxygen is 8, so all of its atoms, regardless of isotope, have 8 protons. In a neutral oxygen atom the number of protons equals the number of electrons, so it has 8 electrons. The number of neutrons equals the mass number minus the atomic number, which for oxygen-18 is (18 - 8), so there are 10 neutrons.
Period (row) 4 Group 18, 0 or 8, depending on how complex your table is. I would go with 8 as it is probably simplest
The number of electrons in the electron shells are 2, 8, 18, 18, 8.
8 with remainder 20.
Two.
The atomic number of an isotope is the number of protons it contains, whereas the mass number is the total mass of the nucleus, which is the combined number of protons and neutrons in the nucleus. To find the number of neutrons, you must therefore subtract the atomic number of the isotope from the mass number of the isotope.In the above example, the atomic number is 8 and the mass number is 18. This isotope is known as O18. The number of neutrons in the isotope is: Mass number - Atomic number = Number of neutrons18 - 8 = 10