Loml! interesting tutorials i really love it.....

wow
interesting tutorial 
I really love it

<section>
<h2 class="title">Summary</h2>
<ul>
<li>
Elements are arranged in periods and groups on the periodic table. The <a data-lesson="elements" data-subject="chemistry" data-tutorial="classification-of-matter" href="https://app.ulearngo.com/chemistry/classification-of-matter/elements">elements</a> are arranged according to increasing atomic number.
</li>
<li>
A group is a <a data-lesson="obtaining-nitrogen" data-subject="chemistry" data-tutorial="chemistry-real-world" href="https://app.ulearngo.com/chemistry/chemistry-real-world/obtaining-nitrogen">column</a> on the <a data-lesson="periodic-table-of-elements" data-subject="chemistry" data-tutorial="atoms-molecules-ions" href="https://app.ulearngo.com/chemistry/atoms-molecules-ions/periodic-table-of-elements">periodic table</a> containing elements with similar properties. A period is a row on the periodic table.
</li>
<li>
The atomic radius is a measure of the size of the atom.
</li>
<li>
The first ionisation <a data-lesson="energy" data-subject="chemistry" data-tutorial="thermochemistry" href="https://app.ulearngo.com/chemistry/thermochemistry/energy">energy</a> is the energy needed to remove one electron from an atom in the <a data-lesson="non-ideal-gas-behavior" data-subject="chemistry" data-tutorial="gases" href="https://app.ulearngo.com/chemistry/gases/non-ideal-gas-behavior">gas</a> phase.
</li>
<li>
Electronegativity is the tendency of atoms to attract electrons.
</li>
<li>
Across a period the ionisation energy and <a data-lesson="electronegativity" data-subject="chemistry" data-tutorial="chemical-bonding" href="https://app.ulearngo.com/chemistry/chemical-bonding/electronegativity">electronegativity</a> increase. The atomic radius decreases across a period.
</li>
<li>
The groups on the periodic table are labelled from 1 to 18. Group 1 is known as the alkali metals, <a data-lesson="chemical-properties-of-the-groups" data-subject="chemistry" data-tutorial="classification-of-matter" href="https://app.ulearngo.com/chemistry/classification-of-matter/chemical-properties-of-the-groups">group</a> 2 is known as the alkali earth metals, group 17 is known as the <a data-lesson="occurrence-and-preparation-of-halogens" data-subject="chemistry" data-tutorial="metals-metalloids-nonmetals" href="https://app.ulearngo.com/chemistry/metals-metalloids-nonmetals/occurrence-and-preparation-of-halogens">halogens</a> and the group 18 is known as the noble gases. The elements in a group have similar properties.
</li>
<li>
The atomic radius and the density both increase down a group. The ionisation energy, electronegativity, and melting and <a data-lesson="boiling-points" data-subject="chemistry" data-tutorial="liquids-and-solids" href="https://app.ulearngo.com/chemistry/liquids-and-solids/boiling-points">boiling points</a> all decrease down a group.
</li>
</ul>
</section>

1da7dde6-444c-4cfc-9055-98f781c809ca

Summary and Main Ideas

Chemistry generally explores the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances. 

Chemistry

Explore the arrangement of elements and learn about materials, mixtures, pure substances, and separation techniques, including chemical formulae and important concepts such as periods in the periodic table and chemical properties of groups.


Summary and Main Ideas

Track Your Learning Progress

Earlier discussion