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Mass number - atomic number is equal to the number of what particle?


Number of protons + number of neutrons=?

mass of atom

Unique whole number associated with each element?

Atomic number

The atomic number is equal to what?

the number of protons

In a neutral atom the number of protons + the number of _____ is equal.


atomic number of uranium


number of protons in uranium


²³⁵U. number of neutrons?


U²⁺. number of electrons?


²³⁸U. number of neutrons?


the electron was discovered by?


the experiment that revealed electrons (Rutherford)?

oil droplets

who discovered radioactivity?


2 atoms are isotopes if they contain...

the same number of protons and electrons

light has properties of....

both particles and waves

what is not a form of electromagnetic radiation?

sound waves

which wave property says how often a wave oscillate?


symbol for wavelength?


quanta are fundamental pieces of?


who proposed the idea of quanta?


Which person explained how quantization could be used to account for line spectra of elements?


Wavelength is defined as the distance between..

successive crests of a wave

who explained the photoelectric effect?


who explained matter?

de Broglie

the quantum mechanical model treats atoms by..

electrons as a wave of quantized energy

Under what conditions can 2 electrons occupy the same orbital?

Opposite spins

The prop of finding electrons is certain regions of an atom is


When electrons are in the lowest energy level possible they are in the

ground state

Which of the following elements is this:
1s² 2s² 2s³


Which of the following elements is this:
1s² 2s² 2p⁵


Which of the following elements is this:
1s² 2s² 2p⁶ 3s²


Which of the following elements is this:
1s² 2s² 2p⁶ 3s² 3p²


Which of the following elements is this:
1s² 2s² 2p⁶ 3s¹


Who discovered the concept of atomic number?


Mendeleev arranged the elements in order of increasing

atomic number

The scientist credited with the first periodic table is


The elements in group one of the Periodic Table is

Alkali Metal

Elements in group 18 are

Nobel gases

Elements in group two are

Alkaline earth metal

Mailability is a characteristic of


What are the elements in group 17?


Those electrons that are responsible for an atom's chemical behavior are

valence electrons

Valence electrons in an atom are always

outermost electrons

The second period of the periodic table contains

S and P block

As you move from left to right along the periods the atomic radii


Mendeleev organized the chemical elements based on their


A horizontal row in the periodic table is called a(n)


The periodic law states that

the physical and chemical properties of the elements are functions of their atomic number

an element with the general electron configureation ns² np¹ for its outermost electrons would be in group


When a carbon atom is in its ground state, how many electrons does it have in its outermost shell?


Light has properties of

waves only

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