Elements are grouped into periods and groups . Elements with same number of energy shells are in the same period and elements with the same number of electrons in the outermost energy shells are in the same group.
Reactivity depends on the number of valence electrons. Number of valence electrons the element has will determine if the element needs to gain electrons or give out electrons.
Therefore elements with same number of valence electrons will have similar chemical properties .
When you look at elements in the same group(column) they have similar chemical properties
⁷⁰₂₉Cu
Explanation:
Copper-70 isotope in nuclide form.
A nuclide is designated as: ₙᵇX
Where X is the symbol of the atom
b is the mass number of the atom
n is the atomic number
Mass number is the number of protons and neutrons in an atom. These particles makes up the bulk of the mass of an atom.
Atomic number is the number of protons in an atom. For neutral atom, it is the same as the number of electrons.
To write Copper-70 in nuclide format:
Symbol of Copper is Cu
Mass number is 70
Atomic number from periodic table is 29
⁷⁰₂₉Cu
Learn more:
Atomic number brainly.com/question/5425825
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Answer: B. The molecules move faster and become less dense
Explanation:
Liquid is the state of matter in which particles are less tightly bound as compared to solids as they have weak inter molecular forces as compared to solids.
Thus when a solid is heated, the molecules start moving in random motion due to an increase in the kinetic energy. The molecules move apart as the forces will be weak and thus less molecules will be present per unit volume. Thus it will become less dense.
The parts of a chemical reaction are the reactants and products. The reactants are on the left side of the chemical equation and they are what’s gonna go through a chemical reaction and change properties. The products are the result of the chemical reaction
