ABC एक समद्विबाहु त्रिभुज है जिसका कोण C समद
प्र.-20 A.P: 21, 18, 15------------- का कौन सा पद -81 है?
अथवा
दो अंकों वाली कितनी संख्याएँ 3 से विभाज्य हैं?
प्र.-21 यदि किसी A.P. के प्रथम 14 पदों का योग 1050
ज्ञात कीजिए।
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Step-by-step explanation:
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across. Wikipedia
Components: Electrons and a compact nucleus of protons and neutrons
Electric charge: zero (neutral), or ion charge
Mass range: 1.67×10−27 to 4.52×10−25 kg
Diameter range: 62 pm (He) to 520 pm (Cs) (data page)
Elements
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