Nguyên tử của nguyên tố hóa học Y có tổng số hạt cơ bản là 49, trong đó số hạt không mang điện bằng 53,125% số hạt mang điện. Cho biết tên gọi và kí hiệu hóa học của Y.

Các câu hỏi liên quan

133.Are you free on…………….. A. today B. Sunday C. May D. April 134.going to / Da Nang tomorrow? / travel to /are you / How ................................................................................................................................................... 135. writing / to / she is /her friend. / a letter ................................................................................................................................................... 136. Children should br _ _ _ their teeth twice a day. 137. What’s the matter with you, Nam? – I have a toothache. Oh, _ _ _ _ you. 138. Don’t ……………..sad. Let’s smile. A. be B. have C. go D. do 139. The cat is under the ……………… (nghe) A. box B. bed C. shelf D. clothes 140.has / a banana / in / its hand. / The monkey ................................................................................................................................................... 141. last / Sunday. / rainy / was / It ................................................................................................................................................... 142. The lamp is on the …………….(nghe) 143. BRU_H 144. What did you…………..and…………….on Minh’s birthday party? A. ate / drinked B. ate / drink C. eat / drink D. ate / drink 145. Did you go to school on………………or by bike? A. toe B. foot C. knee D. leg 146. the doctor. / so I want / to see / I have got / a headache ................................................................................................................................................... 147.We / in / playing games / are / the schoolyard. ................................................................................................................................................... 148. What’s your favoutite _ _ _ _ _ _ _ ? – Maths. 149. My uncle takes the _ _ _ _ _ _ _ _ _ _ to the city by lorry. 150. What is Elena’s date of birth? - ……………. A. September 2nd B. September and 2nd C. 2nd and September D. Septemer 2 151. The sigh says, “Don’t………………” A. stop B. stops C. stopping D. stopped 152. half/ past seven. / go to school / at / I often ................................................................................................................................................... 153.your coat / before / You should / wear / going out. ................................................................................................................................................... 154. How many fingers _ _ _ _ a person have? 155. MAT_ ER 156. What…………………tomorrow evening? A. do you do B. will you do C. did you do D. you will do 157. We use a television to……………… A. watch films B. say “ hello” C. write things D. play football 158. a pizza /is / on / There / the plate. ................................................................................................................................................... 159. The bakery / a shoe shop / between / is / and a drugstore. ................................................................................................................................................... 160. What is _ _ _ lunch? – Sandwiches. 161. To the right of the police station, _ _ _ _ _ is a library. 162. Apple juice, soda and………………are cold drinks. A. noodles B. vegetables C. Coke D. beef 163. A. fall B. always C. walk D. half 164. and her friends / the girl / What game / are / playing? ................................................................................................................................................... 165. I / don’t like / ice - creams. / or / cakes ................................................................................................................................................... 166. I have bananas and bread _ _ _ breakfast. 167. Are those your _ _ _ _ _ _ _ ? – No, they aren’t. 168. I can play the guitar and piano………………I can’t dance. A. because B. and C. when D. but