Lawrencium (Lr)- Periodic Table (Element Information & More)

This is a SUPER easy guide on Lawrencium element.

In fact, the table mentioned below is the perfect information box (Which gives you every single detail about the Lawrencium element in Periodic table.)

So if you want to know anything about the Lawrencium element, then this guide is for you.

Let’s finish this very quickly.

Lawrencium Element (Lr) Information

State (at STP)	Solid (predicted)
Position in Periodic table	Group: actinides, Period: 7, Block: f
Category	Inner transition metals
Atomic number or  Protons	103
Neutrons	159
Electrons	103
Symbol	Lr
Atomic mass of Lawrencium (most stable isotope)	266 u
Electrons arrangement or  Bohr model	2, 8, 18, 32, 32, 9, 2
Electronic configuration	[Rn] 5f14 7s2 7p1
Electronegativity	1.3 (Pauling scale)
Crystal structure (predicted)	HCP (hexagonal close packed)
Melting point (predicted)	1900 K or 1627 °C or 2961 °F
Density (predicted)	14.4 g/cm3
Main isotope	262Lr
CAS number	22537-19-5

Lawrencium in Periodic table

Lawrencium element is in period 7 and in actinides group of the Periodic table. Lawrencium is the f-block element and it belongs to inner transition metals group.

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Why is Lawrencium in Period 7?

Let me ask you a question.

How many shells does lawrencium have?

It’s 7. Right?

You have already seen the bohr model of lawrencium atom in the above table.

From the Bohr model, it can be found that the number of orbits or shells in lawrencium is 7. Hence, as lawrencium has 7 orbits, it lies in period 7 of the Periodic table. 

Why is Lawrencium in f-block?

Before knowing this reason, first of all I want to ask you a simple question.

How can you determine the blocks-wise position of elements?

The simple answer: The elements will lie in the s, p, d or f block will completely depend upon the subshell in which the last electron will enter.

For example; the electron configuration of lawrencium is [Rn] 5f¹⁴ 7s² 7p¹.

So the last electron of lawrencium enters the f-subshell or f-orbital. 

Hence, lawrencium is the f-block element.

5 facts about Lawrencium

Interesting facts about lawrencium element are mentioned below.

1. The element was named “Lawrencium” to honor the chemist Ernst Lawrence.
2. Lawrencium was discovered by Georgy Flerov and his colleagues at Joint Institute of National Research and this element was also independently discovered by Albert Ghiorso and his colleagues at Lawrence Berkeley National Laboratory.
3. There are 14 isotopes of lawrencium and all these isotopes are radioactive in nature.
4. Out of all the isotopes of lawrencium, the most stable isotope is ²⁶⁶Lr, which has a half-life of 10 hours.
5. Lawrencium is a synthetic element and it is prepared artificially by humans. Till now, very less quantity of lawrencium has been produced.

Properties of Lawrencium

The physical and chemical properties of lawrencium element are mentioned below.

• Lawrencium is a radioactive element and it is harmful too.
• Just similar to the other actinides, the lawrencium element also shows the +3 and +2 oxidation states.
• The predicted melting point of lawrencium is 1627 °C.
• The atomic mass of the most stable isotope of lawrencium is 266 u and its predicted density is 14.4 g/cm³.
• The predicted crystal structure of lawrencium is HCP (hexagonal close packed).

Uses of Lawrencium

Lawrencium is generally used for scientific research work. It has no commercial uses due to its radioactive nature as well as scarcity.

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External resources:

1. Lawrencium – Element information, properties and uses | Periodic Table. (n.d.). Lawrencium – Element Information, Properties and Uses | Periodic Table. https://www.rsc.org/periodic-table/element/103/lawrencium
2. Lawrencium – Wikipedia. (2020, March 15). Lawrencium – Wikipedia. https://en.wikipedia.org/wiki/Lawrencium
3. P. (n.d.). Lawrencium | Lr (Element) – PubChem. Lawrencium | Lr (Element) – PubChem. https://pubchem.ncbi.nlm.nih.gov/element/Lawrencium
4. It’s Elemental – The Element Lawrencium. (n.d.). It’s Elemental – the Element Lawrencium. https://education.jlab.org/itselemental/ele103.html
5. Lawrencium | CCDC. (n.d.). Lawrencium | CCDC. https://www.ccdc.cam.ac.uk/elements/lawrencium/
6. Periodic Table of Elements: Los Alamos National Laboratory. (n.d.). Periodic Table of Elements: Los Alamos National Laboratory. https://periodic.lanl.gov/103.shtml
7. Nagame, Y. (2016, February 19). Lawrencium’s place at the table. Nature Chemistry, 8(3), 282–282. https://doi.org/10.1038/nchem.2460
8. Henderson, R. A. (2018, July 5). Chemical and nuclear properties of lawrencium (element 103) and hahnium (element 105). Chemical and Nuclear Properties of Lawrencium (Element 103) and Hahnium (Element 105) – UNT Digital Library. https://doi.org/10.2172/6362919
9. Lawrencium experiment could shake up periodic table. (2015, April 8). Lawrencium Experiment Could Shake up Periodic Table | Research | Chemistry World. https://www.chemistryworld.com/news/lawrencium-experiment-could-shake-up-periodic-table/8438.article