Science Question: The maker of the periodic table placed the elements in groups. Describe the criteria he ...?

Question

The maker of the periodic table placed the elements in groups. Describe the criteria he used to place the elements into groups. Please answer this in 5 sentences or more.

Answer 1

Dmitry Mendeleev stated that, "The chemical properties of the elements are a periodic function of their atomic weights." That meant that the elements could be divided into recurring groups. At that time, Mendeleev did not know the concept of atomic number, so that certain relationships got skewed. Today we know that the properties are a periodic function of their atomic number. He arranged the elements in rows so that columns of elements had similar properties. He noticed vacancies in the arrangement and predicted that new elements would be discovered to fill those vacancies.

Answer 2

In the periodic table, elements have something in common if they are in the same row. All of the elements in a period have the same number of atomic orbitals. Every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons. It goes down the periodic table like that. At this time, the maximum number of electron orbitals or electron shells for any element is seven.
The periodic table has a special name for its columns, too. When a column goes from top to bottom, it's called a group. The elements in a group have the same number of electrons in their outer orbital. Every element in the first column (group one) has one electron in its outer shell. Every element on the second column (group two) has two electrons in the outer shell. As you keep counting the columns, you'll know how many electrons are in the outer shell. There are some exceptions to the order when you look at the transition elements, but you get the general idea.

Answer 3

interior the periodic table, factors have some thing in trouble-free in the event that they are interior a similar row. each and all of the climate in a era have a similar style of atomic orbitals. each and every element interior the suitable row (the 1st era) has one orbital for its electrons. each and all of the climate interior the 2d row (the 2d era) have 2 orbitals for his or her electrons. It is going down the periodic table like that. right now, the optimal style of electron orbitals or electron shells for any element is seven. The periodic table has a undeniable call for its columns, too. while a column is going from suitable to backside, it somewhat is noted as a collection. the climate in a collection have a similar style of electrons of their outer orbital. each and every element interior the 1st column (group one) has one electron in its outer shell. each and every element on the 2d column (group 2) has 2 electrons interior the outer shell. As you maintain counting the columns, you will understand what share electrons are interior the outer shell. There are some exceptions to the order once you inspect the transition factors, yet you get the final theory.