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diff --git a/lessons/fisika/atom/atom.html b/lessons/fisika/atom/atom.html
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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="/style.css">
+    <link rel="icon" href="/assets/images/master.png">
+    <title>Al Azhar 9th Grade Lesson Notes</title>
+    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
+    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
+    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
+    <link rel="manifest" href="/site.webmanifest">
+    <script src="https://kit.fontawesome.com/d279a1f519.js" crossorigin="anonymous"></script>
+</head>
+
+<body>
+    <a class="fixed-top-btn menu-btn" onclick="toggleNav()" href="javascript:void(0)"><i
+            class="fa-solid fa-bars"></i></a>
+    <a href="../" class="fixed-top-btn back-btn" id="backbtn"><i class="fa-solid fa-chevron-left"></i></a>
+    <div id="console"></div>
+    <div id="sidebar">
+        <a href="/index.html">
+            <img src="/assets/images/master.png" alt="" class="sidebar-logo">
+        </a>
+        <h3 id="title" class="align-center">Al Azhar 9th Grade Lesson Notes</h3>
+        <hr class="divider">
+        <a href="/about/author.html" class="sidebar-link link">About the Author</a>
+        <a href="/about/school.html" class="sidebar-link link">About School</a>
+        <a href="/lessons" class="sidebar-link link">Lessons</a>
+
+        <hr class="divider">
+        <div id="toc">
+            <h4>Table of Contents</h4>
+        </div>
+    </div>
+
+    <div class="banner-container" id="banner">
+        <div class="banner-bg" id="img-supplies"></div>
+        <h1 class="banner-text" id="banner-txt">Atom: Introduction</h1>
+    </div>
+
+    <div id="main">
+        <section>
+            <h1 id="parts-of-atom">Parts of An Atom</h1>
+            <div class="flex flex-center">
+                <img src="/assets/images/atoms/parts.svg" alt="">
+            </div>
+            <p class="subtitle">artist's representation of an atom. Bohr's Model. Colors may be labelled different.</p>
+            <h1 id="symbol">Symbol of An Atom</h1>
+            <div class="flex flex-center" style="width: 100%;">
+                <img src="/assets/images/atoms/oxygen_symbol.svg" alt=""
+                    style="flex: 1 200px; margin: 30px; min-width: 0px; max-width: 600px;">
+                <img src="/assets/images/atoms/symbol.svg" alt=""
+                    style="flex: 1 200px; margin: 30px; min-width: 0px; max-width: 600px;">
+            </div>
+            <p class="subtitle">(picture on the left) An example of an atom symbol, (picture on the right) The format of
+                an atom symbol</p>
+            <h1 id="proton-electron-neutron-count">Determining the number of Protons, Electrons, and Neutrons</h1>
+            <h2 id="proton-electron-neutron-count--protons-and-electrons">Protons and Electrons</h2>
+            <p>If not electrically charged (will be discussed later), the proton and electron number will be the same as
+                the <strong>atom number</strong>.</p>
+            <h2 id="proton-electron-neutron-count--neutrons">Neutrons</h2>
+            <p>Neutrons can be determined by using this following formula: <br>
+                <strong>Atomic Mass</strong> - <strong>Atomic Number</strong> = Neutron Number
+            <h2 id="proton-electron-neutron-count--example">Examples</h2>
+            <div class="flex" style="width: 100%;">
+                <img src="/assets/images/atoms/natrium_symbol.svg" alt="" style="max-width: 200px; margin: 20px;">
+                <p>
+                    <strong>Proton:</strong> 11<br>
+                    <strong>Electron:</strong> 11<br>
+                    <strong>Neutron:</strong> 23 - 11 = 12
+                </p>
+            </div>
+            <h1 id="ions">Ions</h1>
+        </section>
+    </div>
+
+    <script src="/scripts/toc.js"></script>
+    <script src="/scripts/sidebar.js"></script>
+</body>
+
+</html>
+\ No newline at end of file
diff --git a/lessons/fisika/atom/electron-config.html b/lessons/fisika/atom/electron-config.html
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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="/style.css">
+    <link rel="icon" href="/assets/images/master.png">
+    <title>Al Azhar 9th Grade Lesson Notes</title>
+    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
+    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
+    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
+    <link rel="manifest" href="/site.webmanifest">
+    <script src="https://kit.fontawesome.com/d279a1f519.js" crossorigin="anonymous"></script>
+</head>
+
+<body>
+    <a class="fixed-top-btn menu-btn" onclick="toggleNav()" href="javascript:void(0)"><i
+            class="fa-solid fa-bars"></i></a>
+    <a href="../" class="fixed-top-btn back-btn" id="backbtn"><i class="fa-solid fa-chevron-left"></i></a>
+    <div id="console"></div>
+    <div id="sidebar">
+        <a href="/index.html">
+            <img src="/assets/images/master.png" alt="" class="sidebar-logo">
+        </a>
+        <h3 id="title" class="align-center">Al Azhar 9th Grade Lesson Notes</h3>
+        <hr class="divider">
+        <a href="/about/author.html" class="sidebar-link link">About the Author</a>
+        <a href="/about/school.html" class="sidebar-link link">About School</a>
+        <a href="/lessons" class="sidebar-link link">Lessons</a>
+
+
+        <hr class="divider">
+        <div id="toc">
+            <h4>Table of Contents</h4>
+        </div>
+    </div>
+
+    <div class="banner-container" id="banner">
+        <div class="banner-bg" id="img-supplies"></div>
+        <h1 class="banner-text" id="banner-txt">Electron Configuration</h1>
+    </div>
+
+    <div id="main">
+        <section>
+            <h1 id="electron-config">Electron Configuration</h1>
+            <div class="flex flex-center">
+                <img src="/assets/images/atoms/electron_configuration.svg" alt="">
+            </div>
+            <h2 id="electron-config--how-to-read">How to Read / Order</h2>
+            <ol>
+                <li>Start from the top-most arrow</li>
+                <li>Follow the direction of the arrow. For example;</li>
+                <ol>
+                    <li>1s, 2s, 2p, 3s</li>
+                </ol>
+                <li>Exponent the electron with maximum number of electron until the total of exponents is equals to Atom Number.</li>
+                <li>If the total is more than Atom Number, subtract the the last electron's exponent to make the total equals to the atom number.</li>
+            </ol>
+            <h2 id="electron-config--examples">Examples</h2>
+            <h1 id="electron-config-based-on-shell">Electron Configuration Based on Shell</h1>
+            <div class="flex flex-center">
+                <img src="/assets/images/atoms/oxygen.svg" alt="" style="max-width: 300px;">
+            </div>
+            <p class="subtitle">an atom figure with shell labels (Oxygen)</p>
+            <h2 id="electron-config-based-on-shell--example">How to Determine Electron Count</h2>
+            <table></table>
+            <h2 id="electron-config-based-on-shell--examples">Examples</h2>
+        </section>
+    </div>
+
+    <script src="/scripts/toc.js"></script>
+    <script src="/scripts/sidebar.js"></script>
+</body>
+
+</html>
+\ No newline at end of file