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


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:

Z=18  

A=39.948 u

number of neutrons=39.948-18=

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

Z=30  

A=65.38 u

number of neutrons=65.38-30=

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

Z=31  

A=69.723 u

number of neutrons=69.723-31=

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

Z=35

A=79.904 u

number of neutrons=79.904-35=

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

Z=74

A=183.84 u

number of neutrons=183.84-74=

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

Z=95

A=243 u

number of neutrons=243-95=148

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

b

explanation:

mitosis

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.