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A quark (/ k w ɔːr k, k w ɑːr k /) is a type of elementary particle and a fundamental constituent of matter.Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei. [1]
A model of an atomic nucleus showing it as a compact bundle of protons (red) and neutrons (blue), the two types of nucleons.In this diagram, protons and neutrons look like little balls stuck together, but an actual nucleus (as understood by modern nuclear physics) cannot be explained like this, but only by using quantum mechanics.
A chemical element is a chemical substance whose atoms all have the same number of protons.The number of protons is called the atomic number of that element. For example, oxygen has an atomic number of 8, meaning each oxygen atom has 8 protons in its nucleus.
A diagram comparing the size of an average human diver to the size of the modern great white shark, whale shark, and the prehistoric megalodon.The illustration also contains a linear measurement in meters in the middle.
Syria, [d] officially the Syrian Arab Republic, [e] [15] is a country in West Asia located in the Eastern Mediterranean and the Levant.It borders the Mediterranean Sea to the west, Turkey to the north, Iraq to the east and southeast, Jordan to the south, and Israel and Lebanon to the southwest.
Nguyen Dinh Duc [10] was born in his maternal hometown of Lai Xa village, Kim Chung commune, Hoai Duc district (former Ha Tay province), now part of Hanoi. [11] Lai Xa is known as a land of learning and is the birthplace of Vietnam's first Minister of Education, Professor Nguyen Van Huyen, and renowned astronomer Professor Nguyen Quang Rieu.