Chemistry, 03.01.2020 07:31 roseemariehunter12

7. how many protons, neutrons, and electrons are in the following atoms? (a) 40ar (b) 65zn (c) 70ga (d) 80br (e) 184w (f) 243am.  

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Answer from: joyelewis58

Answers:

a) 18 protons, 22 neutrons and 18 electrons

b) 30 protons, 35 neutrons and 30 electrons

c) 31 protons, 39 neutrons and 31 electrons

d) 35 protons, 45 neutrons and 35 electrons

e) 74 protons, 110 neutrons and 74 electrons

f) 95 protons, 148 neutrons and 95 electrons

Explanation:

When we search an element in the Periodic Table, we can find its Atomic number (Z) and its Mass number (A).

Let's talk about them:

Assuming we are deailling with neutral atoms, which have the same number of electrons as number of protons, the atomic number Z indicates us the number of protons and electrons an atom has.

On the other hand, the mass number A gives us information about the number of protons and neutrons in the atom:

A=Z+number of neutrons

Hence:

number of neutrons=A-Z

So, taking this into account let's begin with the answers:

a) Argon (Ar)

Z=18

A=39.948 u

number of neutrons=39.948-18= $21.948 \approx 22$

This means the Argon atom has:18 protons, 22 neutrons and 18 electrons

b) Zinc (Zn)

Z=30

A=65.38 u

number of neutrons=65.38-30= $35.38 \approx 35$

This means the Zinc atom has: 30 protons, 35 neutrons and 30 electrons

c) Gallium (Ga)

Z=31

A=69.723 u

number of neutrons=69.723-31= $38.72 \approx 39$

This means the Gallium atom has: 31 protons, 39 neutrons and 31 electrons

d) Bromine (Br)

Z=35

A=79.904 u

number of neutrons=79.904-35= $44.904 \approx 45$

This means the Bromine atom has: 35 protons, 45 neutrons and 35 electrons

e) Wolframium (Tungsten) (W)

Z=74

A=183.84 u

number of neutrons=183.84-74= $109.84 \approx 110$

This means the Wolframium atom has: 74 protons, 110 neutrons and 74 electrons

f) Americium (Am)

Z=95

A=243 u

number of neutrons=243-95=148

This means the Americium atom has:95 protons, 148 neutrons and 95 electrons

Answer from: Quest

the answer is the first option

explanation:

just googled it m8. not that hard

lol

Answer from: Quest

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

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7. how many protons, neutrons, and electrons are in the following atoms? (a) 40ar (b) 65zn (c) 70ga...