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Yes, at least 91 elements occur naturally: all of those with atomic numbers of 92 or less except technetium. This still means that the problem "statement" is true, because it does not contain any limiting word such as "only" to modify the number 90. (It is equally true that 2 elements occur naturally.)
What else can I help you with?
True or false mendeleev also grouped elements that has similar properties?
True. Mendeleev organized the elements into the periodic table based on their atomic weight and similar chemical properties. He noticed that elements with similar properties tended to occur at regular intervals, leading to the periodicity of the elements.
Most of the elements are solids true or false?
True. The majority of elements on the periodic table are solids at room temperature and pressure.
True or false most elements are nonmetal?
Most elements are metals.
True or false Au is the symbol for gold on the periodic table of elements?
True. Au is the symbol for gold on the periodic table of elements.
Is it true that transuranium elements are synthetic elements with atomic numbers greater than 92?
Yes. All elements classified after Element Atomic Number 92 (Uranium) (id est transuranium) are synthesised elements and can not be found naturally. They are also all radioactive, although this is the case for elements from elements 84 onwards.
True or false more than 100 different elements occur on earth?
true
Is it true that the lightest elements in early earth moved to the center of the planet?
true
Almost all the Elements on Earth were produced in Supernovae?
true
What is wrong with the statement all metallic elements are magnetic?
It just is not true. Even iron is not naturally magnetic.
What is a true state meant about gravity?
earth rotation on its axis causes gravity to occur on earth
True or false the troposphere is the area of the atmosphere closest to earth?
True. The troposphere is the lowermost layer of Earth's atmosphere, and it is the layer closest to the Earth's surface where all weather events occur.
Is it true that the elements found in magma are quite different from those found in earths crust?
Yes, the elements found in magma and the Earth's crust can be different due to the melting and differentiation processes that occur in the Earth's interior. While both can contain common elements, the magma tends to have higher concentrations of elements that preferentially partition into the melt during melting processes, leading to some differences in composition.
Does a lunar eclipse occur when the moon travels through the shadow of the earth?
Yes it is true.
True or false mendeleev also grouped elements that has similar properties?
True. Mendeleev organized the elements into the periodic table based on their atomic weight and similar chemical properties. He noticed that elements with similar properties tended to occur at regular intervals, leading to the periodicity of the elements.
Although some substances we encounter in our routine lives are elements most occur in the combined state.?
Yes, it is true; chemical elements react to form compounds.
Elements abundant in the body are not abundant on Earth true or false?
False. Elements abundant in the human body, such as oxygen, carbon, hydrogen, and nitrogen, are also abundant in the Earth's crust.
Is radioactivity man made?
Some isotopes of elements are naturally radioactive, meaning they emit radiation spontaneously. However, humans have also created radioactive isotopes through processes such as nuclear reactors and weapons testing. So while radioactivity can occur naturally, it can also be man-made.
