Answer:
Iron is made up of ferromagnetic material.
Explanation:
Answer: Elements in the last period are radioactive.
Explanation:
C-12 and C-13 are isotopes of the element carbon. Since they are both of the same element, they have the same number of protons. The number that follows the C indicates the number of neutrons. Isotopes are variations of the element with different number of neutrons. C-12 shows that that variation of carbon has 6 protons and 6 neutrons for a total mass of 12. C-13 shows that it has 6 protons but 7 neutrons for a total mass of 13
Answer: Electrons or Energy Levels
Explanation: Electrons are found in areas called shells. A shell is sometimes called an energy level.
SI derived units are units of measurement derived from the seven base units specified by the International System of Units (SI). They are either dimensionless or can be expressed as a product of one or more of the base units, possibly scaled by an appropriate power of exponentiation.