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- 1What is an element ? (1 mark)The simplest substance that can't be broken down into simpler substances by all means.
- 2What is a Compound ? (1 mark)A molecule that consists of two or more elements that bonds chemically in a fixed ratio.
- 3What is an atom ? (1 mark)The smallest part of an element that can take part in a chemical reaction.
- 4Can you write the symbol of an element ? (2 marks)No, it's always printed. An element's symbol with 2 letters has one capital in the beginning. If an element has 1 letter, then that letter would be in capital.
- 5Describe the term atoms ? (2 marks)Atoms are the smallest part of an element that can be broken down- without changing it. Atoms are not actually the smallest building blocks that make up the universe. It's actually the subatomic particles within the atom. Atoms can be split into smaller parts.
- 6Explain the terms protons and neutron. (3 marks)Both protons and neutrons are tightly packed together in the centre of the atom (nucleus). They are so tightly packed together that they can vibrate about fixed positions. Protons are positively charged and neutrons have no charge. And both of their mass is 1.67 times 10 to the power of -27.
- 7Explain electrons? (3 marks)Electrons are subatomic particles that move around the region of space around the nucleus of the atom. Because of their extremely small size and wave-like properties, it's hard to identify how fast it moves. That's why we describe a region of space where electrons are most likely to be in (electron cloud).
- 8What are isotopes? (2 marks)Isotopes are atoms of the same elements that contain different numbers of neutrons in the nucleus. If the number of neutrons in the elements changes, then the mass number will also change as well. The number of protons and electrons remains the same.
- 9Examples of IsoptopesCarbon: 12, 13, 14 (radioactive)
Hydrogen: 1, 2, 3
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- Flashcards on Untitled, created by tasnia uddin on 04/08/2022.
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