Question

25 mn manganese 54.938 atomic # = atomic mass = mass number = # of protons = # of neutrons = # of electrons = 19 k potassium 39.098 atomic # = atomic mass = mass number = # of protons = # of neutrons = # of electrons = 9 f fluorine 18.998 atomic # = atomic mass = mass number = # of protons = # of neutrons = # of electrons =

Explanation:

Step1: Recall atomic number concept

Atomic number is the number at the top of the element box. For Mn, it is 25; for K, it is 19; for F, it is 9.

Step2: Recall atomic mass

Atomic mass is given below the element name. For Mn, it is 54.938; for K, it is 39.098; for F, it is 18.998.

Step3: Recall mass - number approximation

Mass number is approximately the whole - number part of atomic mass. For Mn, it is 55; for K, it is 39; for F, it is 19.

Step4: Recall proton number

Number of protons = atomic number. For Mn, it is 25; for K, it is 19; for F, it is 9.

Step5: Calculate neutron number

Number of neutrons = mass number - number of protons. For Mn: $55 - 25=30$; for K: $39 - 19 = 20$; for F: $19 - 9=10$.

Step6: Recall electron number in neutral atom

In a neutral atom, number of electrons = number of protons. For Mn, it is 25; for K, it is 19; for F, it is 9.

For Manganese (Mn):

Atomic # = 25
Atomic Mass = 54.938
Mass Number = 55

of Protons = 25

of Neutrons = 30

of Electrons = 25

For Potassium (K):

Atomic # = 19
Atomic Mass = 39.098
Mass Number = 39

of Protons = 19

of Neutrons = 20

of Electrons = 19

For Fluorine (F):

Atomic # = 9
Atomic Mass = 18.998
Mass Number = 19

of Protons = 9

of Neutrons = 10

of Electrons = 9

Answer:

Step1: Recall atomic number concept

Atomic number is the number at the top of the element box. For Mn, it is 25; for K, it is 19; for F, it is 9.

Step2: Recall atomic mass

Atomic mass is given below the element name. For Mn, it is 54.938; for K, it is 39.098; for F, it is 18.998.

Step3: Recall mass - number approximation

Mass number is approximately the whole - number part of atomic mass. For Mn, it is 55; for K, it is 39; for F, it is 19.

Step4: Recall proton number

Number of protons = atomic number. For Mn, it is 25; for K, it is 19; for F, it is 9.

Step5: Calculate neutron number

Number of neutrons = mass number - number of protons. For Mn: $55 - 25=30$; for K: $39 - 19 = 20$; for F: $19 - 9=10$.

Step6: Recall electron number in neutral atom

In a neutral atom, number of electrons = number of protons. For Mn, it is 25; for K, it is 19; for F, it is 9.

For Manganese (Mn):

Atomic # = 25
Atomic Mass = 54.938
Mass Number = 55

of Protons = 25

of Neutrons = 30

of Electrons = 25

For Potassium (K):

Atomic # = 19
Atomic Mass = 39.098
Mass Number = 39

of Protons = 19

of Neutrons = 20

of Electrons = 19

For Fluorine (F):

Atomic # = 9
Atomic Mass = 18.998
Mass Number = 19

of Protons = 9

of Neutrons = 10

of Electrons = 9