When a mercury-202 nucleus is bombarded with a neutron, a proton is ejected. what element is formed?

That will make a gold-202 nucleus.

Refer to a periodic table. The atomic number of mercury Hg is 80.

Step One: Bombard the with a neutron . The neutron will add 1 to the mass number 202 of . However, the atomic number will stay the same.

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Double check the equation:

Step Two: The nucleus loses a proton . Both the mass number 203 and the atomic number will decrease by 1.

Refer to a periodic table. What's the element with atomic number 79? Gold Au.

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Double check the equation:

A gold-202 nucleus is formed.

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.