The basic unit of an element.

(a)  

_____ is the Greek philosopher who discovered atoms around _____ BCE.

(a)  

The atom is derived from the Greek word (a)   which means indivisible.

What is the smallest unit of matter?

(a)  

Atoms are composed of three particles called as (a)   .

What are the subatomic particles of an atom? (by weight arrangement ng sagot, heaviest to lightest)

(a)  

The center of an atom.

(a)  

What are the two subatomic particles inside the nucleus? (by weight arrangement)

(a)  

_____ surrounds the nucleus in _____.

(a)  

What is the net charge of:

a. protons

b. neutrons

c. electrons

(a)  

What subatomic particle has this symbol:

a. e-

b. p+

c. n^0

(a)  

What do you call a stable atom?

(a)  

The mass of an atom is solely due to the mass of the _____ and _____. (reverse alphabetical arrangement ilalagay sagot)

(a)  

The protons and neutrons are referred as (a)   .

The nucleons which are tightly packed together, form the (a)   within the center of the atom.

What is the symbol of:

a. atomic number

b. mass number

(a)  

The number of protons of an element.

(a)  

The atomic weight or mass.

(a)  

Where are these equations used:

a. n^0 = p+

b. p+ + n^0

c. A - p+

(a)  

The mass of:

a. 9.109 x 10^-28

b. 1.672 x 10^-24

c. 1.678 x 10^-24

(a)  

(a)   is also known as the "billiards ball theory" which suggested that every matter is made up of atoms and that they are indivisible is by John Dalton year 1803.

What model is described by John Joseph Thomson in the year 1904 as a positively charged sphere with electrons inside.

(a)  

Who discovered the presence of electrons?

(a)  

What was the first name of electrons?

(a)  

What experiment was used in the plum pudding model?

(a)  

(a)   is when Ernest Rutherford (1911) modified the atomic structure with the discovery of the subatomic particle and that the atom is mostly empty space.

In what model was the nucleus discovered?

(a)  

What experiment was used in the nuclear model?

(a)  

Neil Bohr (1913) worked with Rutherford's idea and said that Electrons orbit the

nucleus in a circular motion. This resulted to what model?

(a)  

The planetary model is inspired by the (a)   .

Erwin Schrodinger (1926) contradicted Bohr. He found out that the atom is composed of a dense nucleus with protons and neutrons as well as electrons existing on different clouds at various energy levels.

(a)  

Which model is the most accepted in high school?

(a)  

Which model is the most accepted in college?

(a)  

How many known elements are there?

(a)  

Who was the German chemist who formed the triads of element with similar properties?

(a)  

What periodic table was formed in 1817 by Johann Wolfgang Dobereiner?

(a)  

Who was the English chemist who proposed the law of octaves?

(a)  

Newland's octaves was formed by John Newlands in what year?

(a)  

Who were the proponents of the Modern Periodic Table? (alphabetically arranged)

(a)  

Who was the English physicist who observed that the order of X-ray frequencies emitted by elements follows the ordering of elements by atomic number.

(a)  

The Modern Periodic Law was developed by Henry Moseley in what year?

(a)  

What do you call the elements that are in the:

a. horizontal rows

b. vertical rows

(a)  

The elements belonging to a (a)   have similar chemical properties.

The group number corresponds to the number of (a)   in their outermost shell.

What do you call the electrons that are present in the outermost shell?

(a)  

How many groups of elements are there?

(a)  

How many periods are in the elements?

(a)  

Very reactive, soft, malleable, and ductile, good conductors of heat and electricity and only has one valence electron.

(a)  

Second most reactive elements, malleable, ductile, and good conductors of heat

and electricity but not as soft as Group 1 elements

with two valence electrons.

(a)  

Are post-transition metals, except for Boron which is a metalloid and Nihonium which is a synthetic chemical element that is extremely radioactive

with three valence electrons.

(a)  

Also known as the Carbon family, or the tetrels. Elements in this family are the key importance for semiconductor technology, with four valence electrons

(a)  

Also known as pnictogen group, with five valence electrons.

(a)  

Widely known as Oxygen group, they are generally nonmetals

with six valence electrons.

(a)  

Salt formers, they exist in all three states of matter

with seven valence electrons.

(a)  

Stable gases, they are non-reactive or inert elements

with eight valence electrons except Helium.

(a)  

Hard (with Mercury as an exception), they are malleable, ductile, and good conductors of electricity with one and/or two valence electrons.

(a)  

What do you call the inner transition metals?

(a)