Understanding Atomic Symbol and Isotopes in Chemistry

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What does atomic number (Z) represent in a nucleus?

Number of electrons

Number of protons (correct)

Sum of protons and neutrons

Number of neutrons

Which element has 11 protons and 12 neutrons?

Barium

Iron

Sodium (correct)

Oxygen

What is the mass number (A) defined as?

Number of protons

Sum of protons and neutrons (correct)

Number of neutrons

Number of electrons

In what form are ions found?

Charged particles Signup and view all the answers

What did Frederick Soddy receive the Nobel Prize in Chemistry for in 1921?

Discovery of isotopes Signup and view all the answers

What defines the charge on an ion?

Number of electrons Signup and view all the answers

What term was coined in 1913 by Frederick Soddy to describe atoms of the same element with different number of neutrons?

Isotopes Signup and view all the answers

According to Soddy's Nobel lecture, how did he describe isotopes colloquially?

Identical insides, different outsides Signup and view all the answers

What is the atomic number of Carbon-13?

6 Signup and view all the answers

How many neutrons does Deuterium (Hydrogen-2) have?

2 Signup and view all the answers

What is the term used to describe atoms of the same element with the same chemical properties but different radioactive properties?

Isomers Signup and view all the answers

Which element has the atomic symbol C-14?

Carbon-12 Signup and view all the answers

What did Ernest Rutherford propose in his nuclear model of the atom?

The atom is primarily empty space with a small, dense nucleus. Signup and view all the answers

Who discovered neutrons, and where are they located in an atom?

James Chadwick; within the nucleus Signup and view all the answers

Which subatomic particles have similar masses according to the provided data?

Neutrons and Protons Signup and view all the answers

Based on the atomic structure, what is the charge of an electron?

-1 Signup and view all the answers

What is the electric charge of a proton as per the summary of subatomic particles provided?

+1.6022 x 10^-19 C Signup and view all the answers

From the data given, which particle has the smallest mass in atomic units (u)?

Electrons Signup and view all the answers