What is the IUPAC name and symbol for an element with atomic number 119?

📚 Chapter: Classification of Elements and Periodicity in Properties

📘 IUPAC Temporary Name

🔵 Step 1: Atomic Number = 119

For elements whose discovery and official naming have not yet been established, IUPAC uses a systematic temporary naming system based on the digits of the atomic number.

Z = 119

🟢 Step 2: Convert the digits

The IUPAC numerical roots are:

Digit	Root
1	un
1	un
9	enn

Combining the roots gives:

un + un + enn + ium

Ununennium

🎬 3D-Style Atomic Number Animation

The digits of 119 are converted into IUPAC numerical roots.

1 1 9

↓

Un + un + enn + ium

🟣 Step 3: Symbol

The systematic temporary symbol is formed from the initial letters of the numerical roots.

Un + un + enn + ium → Uue

Thus, the temporary systematic designation is:

Ununennium (Uue)

Atomic Number = 119

⚠️ Important Note

The name Ununennium (Uue) is the IUPAC systematic temporary name used for element 119. A permanent official name and symbol would be assigned after the element is successfully discovered, verified and formally named.

📝 MCQ Practice

Q1. What is the systematic IUPAC name for element with atomic number 119?

A) Ununtrium

B) Ununennium

C) Ununium

D) Unbinilium

✅ Show Answer

Answer: B) Ununennium

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Q2. What is the systematic symbol for element 119?

A) Uun

B) Uue

C) Une

D) Uun

✅ Show Answer

Answer: B) Uue

✅ Final Answer

The systematic IUPAC name for the element with atomic number 119 is:

Ununennium (Uue)

It is a temporary systematic name based on the digits of the atomic number.

🎯 Exam Point

Atomic Number → 119

Systematic Name → Ununennium

Systematic Symbol → Uue

What is the significance of the "Atomic Number" over "Atomic Mass" in element classification?

📚 Chapter: Classification of Elements and Periodicity in Properties

📘 Explanation

🔵 Step 1: Atomic Number

The atomic number (Z) is the number of protons present in the nucleus of an atom.

Z = Number of Protons

In a neutral atom, the atomic number is also equal to the number of electrons. Therefore, atomic number determines the electronic configuration of an element.

🟢 Step 2: Why is Atomic Number more important?

The chemical properties of an element depend mainly on its electronic configuration, especially the arrangement of electrons in the outermost shell.

Atomic Number → Electronic Configuration → Chemical Properties

Therefore, atomic number provides a more fundamental basis for classifying elements than atomic mass.

🟠 Step 3: Problems with Atomic Mass

Classification based only on atomic mass could produce certain anomalies. For example, some elements do not follow a strict increasing order of atomic mass when their chemical properties are considered.

Examples include:

Argon (Ar) → Potassium (K)
Cobalt (Co) → Nickel (Ni)
Tellurium (Te) → Iodine (I)

The modern periodic table resolves these issues by arranging elements according to increasing atomic number.

🎬 3D-Style Atomic Number Animation

Increasing atomic number means increasing number of protons and, in a neutral atom, electrons.

Z=1 Z=2 Z=3 Z=4 Z=5

Atomic Number ↑ → Electronic Configuration changes → Properties show periodicity

🟣 Step 4: Importance for Isotopes

Isotopes of the same element have the same atomic number but different mass numbers. Therefore, all isotopes occupy the same position in the modern periodic table.

Same Atomic Number → Same Element → Same Position

✅ Final Answer

Atomic number is preferred over atomic mass because it uniquely identifies an element and determines its electronic configuration, which is responsible for its chemical properties.

Modern Periodic Law:

Properties of elements are periodic functions of their atomic numbers.

📝 MCQ Practice

Q1. The modern periodic table is arranged according to increasing:

A) Atomic mass

B) Atomic number

C) Number of neutrons

D) Mass number

✅ Show Answer

Answer: B) Atomic number

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Q2. Atomic number is equal to the number of:

A) Neutrons

B) Protons

C) Nucleons

D) Shells

✅ Show Answer

Answer: B) Protons

🎯 Exam Point

Atomic Number → Fundamental basis of modern periodic classification

Z = Number of Protons

Z → Electronic Configuration → Chemical Properties

In the present form of the Periodic Table, what determines the number of elements in a period?

📚 Chapter: Classification of Elements and Periodicity in Properties

📘 Explanation

🔵 Step 1: What determines the number of elements?

In the modern periodic table, the number of elements in a period is determined by the number of electrons that can be accommodated in the subshells being filled.

Number of elements in a period → Number of electrons accommodated in the subshells being filled

🟢 Step 2: Length of Different Periods

Period	Subshells Filled	Number of Elements
1st	1s	2
2nd	2s, 2p	8
3rd	3s, 3p	8
4th	4s, 3d, 4p	18
5th	5s, 4d, 5p	18
6th	6s, 4f, 5d, 6p	32
7th	7s, 5f, 6d, 7p	32

🎬 3D-Style Period Animation

As more subshells become available for filling, the length of the period increases.

2 8 8 18 18 32

2 → 8 → 8 → 18 → 18 → 32 → 32

🟣 Step 3: Why are the numbers different?

The maximum number of electrons that can be accommodated in a shell is 2n², but the actual length of a period depends on the order in which different subshells are filled.

1st → 2 elements
2nd & 3rd → 8 elements
4th & 5th → 18 elements
6th & 7th → 32 elements

✅ Final Answer

The number of elements in a period is determined by the number of electrons that can be accommodated in the subshells being filled in that period.

Period Length = Number of electrons accommodated in the subshells being filled

📝 MCQ Practice

Q1. The number of elements in a period is mainly determined by:

A) Atomic mass

B) Number of subshells being filled

C) Number of neutrons

D) Atomic mass number

✅ Show Answer

Answer: B) Number of subshells being filled

🎯 Exam Point

Period Length → Subshell Filling

2, 8, 8, 18, 18, 32, 32