Atomic structure True and false

True

A very stable electrons arrangement in the outer energy level is characteristic of NOBLE GASES

True

According to present atomic theory, the location of an ELECTRON in an atom is best represented by a probability cloud.

False: Decrease

As you move from left to right in a row of the periodic table, metallic properties INCREASE.

False: Family or Groups

Elements arranged in vertical columns in the periodic table are called PERIODS.

False: Metals

Elements having three or fewer electrons in the outer energy level are classified as NONMETALS

True

NONMETALS are poor conductors of heat and electricity.

True

Quarks can be produced by bombarding PROTONS with protons

False: nonmetals

Seven electrons in the outermost energy level is characteristic of a METAL

False: Isotopes

The atomic masses of the elements are not whole value numbers because of the existence of QUARKS.

False: Nucleus

The central core of the atom is called the HUB.

True

The chart showing the classifications of elements according to their properties and increasing atomic numbers is called the PERIODIC TABLE

True

The identity of the element is determined by the number of PROTONS.

False: Neutron

The mass of an ELECTRON is about equal to the mass of proton.

False: 8

The maximum number of electrons in the second energy level of an atom is 4.

False: Atomic Number

The number of protons in an atom is called the ATOMIC MASS.

True

The sum of the number of protons and the number of neutrons in an atom is the MASS NUMBER

False: CL

The symbol for chlorine is C.

False: Mass number

The weighted average of the mass numbers of all the isotopes that occur in nature for a particular element is the AVERAGE ATOMIC NUMBER.

False: Neutrons

Two isotopes of Carbon are carbon-12 and carbon-14. These isotopes differ from one another by two ELECTRONS.