Pure substances Flashcards
Understand the properties and classification of pure substances such as elements and compounds, and their role in chemical reactions.
What is the lightest metallic element?
Lithium
The lightest metal is lithium, with an atomic number of 3 and an atomic weight of about 6.94 g/mol. It is a soft, silvery-white metal that belongs to the alkali metal group and is known for its low density and high reactivity.
In a compound, what bonds are formed through the electrostatic attraction between positively and negatively charged ions?
Ionic bonds
Ionic bonds are a type of chemical bond that occurs when one atom transfers electrons to another atom, resulting in the formation of ions.
Nucleus of an element comprises of what particles?
Protons and Neutrons
Protons are positively charged particles found in the nucleus. Neutrons are neutral particles that have no charge. Together, protons and neutrons are referred to as nucleons. The strong nuclear force holds these particles together within the nucleus, overcoming the electrostatic repulsion between the positively charged protons.
The chemical compound water is made up of what elements?
Hydrogen and Oxygen
In a water molecule, the hydrogen and oxygen atoms are bonded together through covalent bonds, with the oxygen atom sharing electrons with the two hydrogen atoms. This gives water its unique properties, such as its polar nature and ability to form hydrogen bonds with other molecules.
Which chemical element has the symbol âFâ ?
Fluorine
The chemical symbol F represents the element fluorine. Fluorine is a highly reactive, pale yellow gas at room temperature and belongs to the halogen group in the periodic table. Its atomic number is 9, and it is known for its strong electronegativity and ability to form compounds with almost all other elements.
