Groups on the periodic table are:

How many periods are on the periodic table?

Elements in the same group have:

(multiple answers)

Are metals elements: (multiple answer)

Are metalloids elements:

He used the table to predict elements that had not yet been discovered using the properties of the previous elements.

Questioned whether matter coulb be divided into smaller pieces and the smallest piece of matter, the atom, was indivisible.

Democritus named the smallest piece of matter "atomos"

Atom mean is

Atoms were formed of different materials , shapes and sizes.

Atoms were formed of the same material, but were formed into different shapes and sizes.

Declared that all matter was made of only four elements: fire, air, water, and earth.

Believed that matter has just four properties: hot, cold, dry, and wet.

If the Atomic "Model" is fire, aire, water and Earth, then the "Analogy" is

Accepted the idea of Atoms.

Formulated the first atomic theory

Theorized that all matter is made of atoms.

All atoms of a given element are exactly alike

Thomson's hint was that an atom is made of even smaller particles.

Discovered the presence of a negative particle in the atom called electron.

Proposed a model of an atom called the "Plum Pudding" model.

His theory was that atoms are made from a positively charged substance with negatively charged electrons.

Thomson Atomic Model was like raisins in a pudding or chocolate chips in a cookie. (positive charged substance with negatively charge electrons.)

Physist Ernest Rutherford proved that atoms are not a "pudding" filled with a positively charged material.

Proposed that nucleus is tiny compared to the atom as a whole, because an atom is mostly open space!

Concluded that the negative charged particles are scattered outside the nucleus at a distance.

Rutherford's atom model analogy was

Bohr's Atomic Model analogy was:

Dalton's Atomic Model analogy was:

Schrodinger, Heisenberg, Einstein and many other Scientists atomic model's analogy was:

Niels Bohr built on the concept that the mass of an atom is contained mostly in the nucleus.

Theorized that electrons move in definitive orbits around the nucleus.

electrons do not orbit the nucleus but move at high speeds in an electron cloud around the nucleus.

In the electron cloud, electrons whirl around the nucleus billions of times in one second.

Electrons are not moving around the cloud in random patterns. The locations of the electrons depends upon how much energy the electron has.

Electrons are not moving around the cloud in random patterns. The locations of the electrons depends upon how much energy the electron has.

Chadwick Discovered :

Has neutral charge:

Who won the Nobel Prize in Physics in 1935:

The planetarium Model was made by:

Bohr established that:

Proposed to organize the elements by atomic mass in ascending order:

when Elements are arranged in increasing order of Atomic Mass, the properties of every eighth Element starting from any Element are a repetition of the properties of the starting Element.

Julius Lothar Meyer, a German chemist, organized the elements by atomic mass and grouped them according to their chemical properties.

Showed up the connection between the atomic mass and elements properties.

Dmitri Mendeleev, a Russian chemist, organized all the known elements according to similar properties.

are known as the alkali metals

are the pnictogens

are the chalcogens

17 are the halogens

are the halogens

are the noble gases.

inert gas is also noble gas

element and is group

main group are the element's in columns 1, 2, and 12–18

element that is shiny, malleable, good conductor of heat and electricity

element that conducts heat and electricity moderately well,

and possesses some properties of metals and some properties of nonmetals

are the alkaline earth metals

pnictogen

elements in group 15: select more than one if it necessary

noble gas

(also, inert gas) element in group 18

transition metal element in

series (also, period) horizontal row of the period table :

read carefully maybe has multiple correct answer.

element that appears dull, poor conductor of heat and electricity

periodic table is

table of the elements that places elements with similar chemical properties close together

period

(also, series) horizontal row of the periodic table

Determined electron charge 1.602 x 10 ^ -19

Experiment with gold (Au)

Experiment with oil drop

The Modern Periodic Table: (multiple answer)

Concluded the nucleus has protons.

Determined electron charge 1.602 x 10 ^ -19

Li

K

Na

Rb

Fr

Be

Mg

Ca

Sr

Ba

Ra

Oxygen, Sulfur, Se, Te, Po, Lv belongs to group:

metal element is an element that form positive ions and has metallic bonds.

Nonmetal elements don’t form positive ions, nor do they possess metallic bonds. Examples of nonmetal elements include hydrogen, helium, nitrogen, oxygen, fluorine, chlorine,

Metalloids are unique because their properties fall somewhere between those of metal and nonmetal elements.

An orbital is a region of probability in which the electron can be found.

The helium atom is not reactive. In fact, helium is the first of a group of elements often referred to as the inert or noble gases.

Nickel and Copper are Transition Metals.

iron, copper, silver, mercury, lead, aluminum, gold, platinum, zinc, nickel and tin are:

Nitrogen (N), Phosphorus (P) , Arsenic (As), Antomony (Sb), Bi, moscovium (Mc) group:

Cs

Fr

Are good insulators, they are not malleable or solid; they are gaseous.

Metalloids are more like the nonmetals, but several of them can be made to conduct electricity. Are semiconductors.

Are poor conductors of heat and electricity, and are not malleable or ductile

They are hard, good conductors of electricity, and heat, malleable and ductile.

is an atom or group of atoms that has an electric charge.

ions with a positive charge are called:

ions with a negative charge are called:

An ions with a negative charge , gained electrons.

An ions with a positive charge , has less electrons.