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<html><body><h2 id="content-id-5612439078-2"><b>Chemistry Questions Overview</b></h2><p>Chemistry Questions have a good weightage in the Ssc Chsl Exam and the type of question asked in Ssc Chsl exam is similar to the question mentioned below. It has been solved and explained by KD Live Experts under the guidance of Neetu Mam and they have tried to elaborate the concept used in Chemistry Questions.</p><h2 id="content-id-7064913852-3"><b>Question On Chemistry </b></h2>Which of the following elements has atomic number 11?
<div class="row show--dificulty--bar" style="margin-top:8px;"><div class="col-sm-6 show--dificulty--bar" style="display:inline-flex !important;border-right:0.1px solid #eee;"><h3 style="font-size:12px !important;">Difficulty : Easy </h3></div><div class="col-sm-6 show--dificulty--bar" style="display:inline-flex;"><h3 style="font-size:12px !important;"> Average Time : 28 Seconds </h3></div></div><h2 id="content-id-4139607852-4"><b> Chemistry Questions Options</b></h2><ol><li><p>Magnesium</p>
</li><li><p>Nitrogen</p>
</li><li><p>Sodium</p>
</li><li><p>Potassium</p>
</li></ol> <h2 id="content-id-4251369087-5"><b> Chemistry Questions Solution</b></h2><p>The correct answer is <strong>option 3</strong> i.e. <strong>Sodium.</strong></p>

<p><strong>Sodium (Na)</strong> is a highly reactive alkali metal located <strong>in Group 1 and Period 3</strong> of the periodic table with the <strong>atomic number 11</strong>. This means a neutral sodium atom contains exactly 11 protons in its nucleus and 11 electrons orbiting it. Its electronic configuration is 2, 8, 1. Because it has only one valence electron, it easily loses it to form a positive ion <strong>(Na<sup>+</sup>)</strong>, making it essential for various biological processes and industrial applications like common salt production.</p>

<p><strong>Other Options:</strong></p>

<ul>
	<li>
	<p><strong>Magnesium (Mg):</strong> Has atomic number 12; it is an alkaline earth metal used in structural alloys and biological functions.</p>
	</li>
	<li>
	<p><strong>Nitrogen (N):</strong> Has atomic number 7; it is a non-metal that makes up about 78% of Earth's atmosphere.</p>
	</li>
	<li>
	<p><strong>Potassium (K):</strong> Has atomic number 19; like sodium, it is an alkali metal crucial for nerve function and plant growth.</p>
	</li>
</ul>
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