Chemistry Quiz 2

How do you find the number of positive protons using the periodic table?

look for the atomic number

What are the two ways of naming the periodic table groups?

IUPAC and American System (A and B groups)

what group is columns 8, 9, and 10 in on the periodic table?

8B

True or False: the taller groups in the periodic table are group A, while the consecutive short columns are group B.

True

What number is the atomic MASS?

the number directly under the element symbol.

Which number is the atomic NUMBER?

The number directly above the element symbol.

What are the 2 rows of elements separated from the rest of the table called?

Inner transition elements

How do you find the number of neutral neutrons in an element?

Round off the atomic mass to the nearest whole number, then subtract the atomic number.

negative electrons=

number of positive protons

What is the number of negative electrons for Calcium

20

How do you find the number of energy levels/orbitals/shells using the periodic table?

The number of energy levels/shells is the same as the period it is in.

What are the periods in a periodic table?

Each row is a period, numbered 1-7

How do you calculate the charge of an element?

Protons-electrons

Which subatomic particle is used to identify an atom because it never changes for that atom?

Protons

What charge do electrons have

negative

what charge do protons have?

positive

What charge do neutrons have?

neutral

The atomic mass is the number of?

neutrons and protons

What goes inside the center of the atom diagram?

protons and neutrons

What goes on the outside of the atom diagram?

electrons

What identifies an element?

positive protons

How do you know how many valence electrons an element has?

Look at the vertical column number

What elements are not given valence electrons?

b group

Z=

atomic number

A=

mass number

Who discovered protons

Ernest Rutherford

Who discovered neutrons

James Chadwick

Who discovered electrons

JJ Thomson

What is the unit for atomic mass?

amu

What information do you need to calculate the average atomic mass for an element?

relative abundance and mass of each isotope

What are isotopes?

atoms of the same element but with different numbers of neutrons

How many protons are present/What is the atomic number?

40

How many neutrons are present?

50

What is the atomic mass?

91

How many electrons are present?

38