What are outside raw materials used for by an organism?
Organisms utilise the outside raw material as a source of food and oxygen. The amount of raw resources needed depends on how complicated the organism is and where it is living.
What criteria do we use to decide whether something is alive?
It is possible to tell whether something is alive or dead by observing its walking, breathing, growth, and other apparent changes. To determine whether something is alive, the existence of the life process is a key requirement because some living objects will undergo changes that are invisible to the human eye.
Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
Humans and other multicellular organisms need a lot of oxygen to diffuse fast into their enormous bodies in order to meet their oxygen needs. The slow process of diffusion means that it will take a long time for oxygen to reach all of the body\’s cells. Diffusion is too slow to supply enough oxygen to …
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties resembling calcium?
Because calcium (Ca) has a 20 atomic number(Z), the Electronics configuration is 1s2,2s2, 2p6,3s2,3p6,4s2. its electronic arrangement is 2, 8, 8, 2. Calcium, therefore, has two valence electrons. The element with atomic number 12 has an electrical configuration is 1s2,2s2, 2p6,3s2, Its electronic arrangement is 2,8.2. The element that most closely resembles calcium has two valence electrons.
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
The periodic table position of an atom is determined by the number of valence electrons, whereas the number of valence electrons is determined by the electronic configuration of the atom.
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
The atomic number of Nitrogen is 7, Electronic configuration of Nitrogen is 1s2,2s2,2p3 The atomic number of Phosphorus is 15 , Electronic configuration of Phosphorous is 1s2,2s2,2p6,3s2,3p3 On moving top to bottom a group in the periodic table, the number of shells increases. Due to this, valence electrons move away from the electrons and the …
The position of three elements A, B and C in the Periodic Table are shown below– Group 16 Group 17 , – – ,– A , – – , B C (a) State whether A is a metal or non-metal. (b) State whether C is more reactive or less reactive than A. (c) Will C be larger or smaller in size than B? (d) Which type of ion, cation or anion, will be formed by element A?
(a) Element A is a non-metal(b) Element C is less reactive than Element A(c) C is smaller in size than B(d) A will form an anion.
An atom has electronic configuration 2, 8, 7.
(a) What is the atomic number of this element?
(b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.) N(7), F(9), P(15), Ar(18)
(a)The element with electronic configuration (2,8,7) means 17 is chlorine. The no. of atomic number(Z) = no. of electrons(e) Therefore, the atomic number is 17. (b) An atom with electronic configuration 2, 8, 7 would be chemically similar to F (At. No. 9) because it has electronic configuration 2,7, Both have 7 electrons in the …
(a) What property do all elements in the same column of the Periodic Table as boron have in common?
(b) What property do all elements in the same column of the Periodic Table as fluorine have in common?
(a) Group 13 includes all of the elements that are found in the same column as boron. They each have three electrons in their valence shells as a result. All of the other elements in this group, including aluminium, gallium, indium, and thallium, are metals with the exception of boron, which is a non-metal. (b) …
Which element has?
(a) Two shells, both of which are completely filled with electrons?
(b) The electronic configuration 2, 8, 2?
(c) A total of three shells, with four electrons in its valence shell?
(d) A total of two shells, with three electrons in its valence shell?
(e) twice as many electrons in its second shell as in its first shell?
(a) Neon contains two full shells. (b) The electronic configuration of magnesium is 2, 8, 2. (c) Silicon has four electrons in its valence shell and a total of three shells. (d) Boron has three electrons in its valence shell and a total of two shells. (e) The second shell of carbon has twice as …