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There are seven elements with atomic number less than 8: hydrogen, helium, lithium, beryllium, boron, carbon, and nitrogen.
I don't know where you got the notion that there were only four. I thought you might be thinking of Atomic Mass instead, but that doesn't work either ... there are only 3 elements that have stable isotopes with a mass below 8 amu (hydrogen, helium, and lithium). 7Be exists, but it's radioactive.
What else can I help you with?
What element in group one has a higher atomic number than chlorine but lower atomic number than bromine?
The element in group one with a higher atomic number than chlorine but lower atomic number than bromine is iodine. Its atomic number is 53, which is greater than chlorine's atomic number of 17 but less than bromine's atomic number of 35.
What element is in group 1 and has a higher atomic number than chlorine but a lower atomic number than bromine?
It is K, or Potassium, which atomic number is 19, which is greater than 17 and less than 35, and in group 1 of the periodic table, which is the alkali metals.
Isotopes are atoms of the same element that have different atomic masses?
Yes. An element is defined by its atomic number, the number, or the number of protons in its nucleus. When an atom has more or less neutrons it is still the same element, but a different isotope of that element.
What determines the atomic number of an element?
The number of protons in the nucleus of an atom of this element will determine its atomic number. Only this. If the atom is not charged (in other words, not an ion), this is the same as the number of electrons in the atom. In that case, the number of electrons will be the same as the number of protons. But it is the proton count that sets or determines atomic number.
Has two electrons less than element c and ends its electron configuration in 3d9?
The element in question has an atomic number that is 2 less than element C and its electron configuration ends in 3d9. This would suggest that the element is one of the transition metals that comes before element C in the periodic table. A possible candidate fitting this description is manganese (Mn), which has an atomic number of 25 and an electron configuration of [Ar] 3d5 4s2.
Does Alpha decay results the lighter elements?
Yes, daughter element has atomic number two units less and atomic mass four units less.
What element can have the atomic number 118 and also the mass number 50?
No element can have those features; the mass can never be less than the atomic number in any element.
Which element with 626 as atomic number?
None! The highest atomic number known is less than 130.
What is the atomic number and atomic mass of this element?
Atomic number is the number of protons. Atomic mass is (mostly) the sum of the masses of the protons and neutrons (more or less).
What element has the atomic number less that sodium and is a metal?
Something Stupid,y?
What is the new element formed after the alpha decay occurred?
AlphaThe atomic number goes down by two and the atomic mass number goes down by four.Beta-The atomic number goes up by one and the atomic mass number stays the same.Beta+The atomic number goes down by one and the atomic mass number stays the same.
What element in group one has a higher atomic number than chlorine but lower atomic number than bromine?
The element in group one with a higher atomic number than chlorine but lower atomic number than bromine is iodine. Its atomic number is 53, which is greater than chlorine's atomic number of 17 but less than bromine's atomic number of 35.
A metal containing 3 valence electrons and 13 protons in its atom is what metal?
The fact that the element has 13 protons indicates that this element is aluminum. The number of protons in the nucleus is the atomic number of an element. Every element has its own unique atomic number that never changes in ordinary chemical or physical reactions.
What is the lowest atomic number in the periodic table?
Atomic number: The number of protons in an atomic nucleus. (http://www.answers.com/topic/atomic-number) So the lowest atomic number is 1, which is hydrogen, as you cannot have an element with less than one proton.
Why is the atomic number included in the periodic table?
Presumably because atomic number is the fundamental characteristic for organizing the periodic table itself. Every element in the interior of a period of the periodic table has an atomic number greater by 1 than its neighbor to the left and less by 1 than its neighbor to the right; every element (except hydrogen) at the left end of a periodic table period has an atomic number greater by one than the rightmost member of the preceding period; and every element at the right end of a periodic table periodic has an atomic number less by 1 than the leftmost element in the succeeding period, if such a succeeding period exists.
One element that is always radioactive and has an atomic number less than 50?
Technetium (Tc) is the element that is always radioactive and has an atomic number less than 50. It has no stable isotopes and is synthetic, with its most stable isotope having a half-life of about 4.2 million years.
How can you use the parent element to determine the daughter element in alpha decay?
In alpha decay, the parent element (nucleus) emits an alpha particle consisting of 2 protons and 2 neutrons. The daughter element is formed by subtracting the alpha particle from the parent element's atomic number and mass number. The daughter element is often located two positions to the left on the periodic table compared to the parent element.
